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Gastrointestinal Tract (GIT)//DIGESTIVE SYSTEM Wasim Ak
The digestive tract or gastrointestinal tract ( GIT) is composed of mouth , pharynx, oesophagus, stomach , small intestine and large intestine .
This GIT will helps in digestion of food and absorption of needed nutrients into our body .
This my original work on Anatomy of digestive system, therefore it is strongly forbidden to copy, share and foreword without the permission of the authors to the third person or anybody else.
Gastrointestinal Tract (GIT)//DIGESTIVE SYSTEM Wasim Ak
The digestive tract or gastrointestinal tract ( GIT) is composed of mouth , pharynx, oesophagus, stomach , small intestine and large intestine .
This GIT will helps in digestion of food and absorption of needed nutrients into our body .
This my original work on Anatomy of digestive system, therefore it is strongly forbidden to copy, share and foreword without the permission of the authors to the third person or anybody else.
Digestive system Mouth Buccal cavity Tongue Teeth Salivary glands Pharynx Oesophagus Stomach Small intestine Large intestine Rectum Anus Liver Gall bladder Pancreas Absorption Digestion
This presentation is made for the purpose of understanding the Anatomy and physiology of the Upper GI /Digestive system form the mouth to the upper small íntestine
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This presentation is made for the purpose of understanding the Anatomy and physiology of the Upper GI /Digestive system form the mouth to the upper small íntestine
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6. DIGESTION AND ABSORPTION
Human digestive system consists of……
Alimentary canal Associated digestive glands
7. DIGESTION AND ABSORPTION
Alimentary canal/ Digestive tract
• Buccal cavity
• Pharynx
• Oesophagus
• Stomach
• Small intestine
• Large intestine
The alimentary canal of man
begins with the anterior
opening, the mouth, and ends
with the posterior opening,
the anus. Between the mouth
and anus the following parts
are included.
11. DIGESTION AND ABSORPTION
Uppermost transverse slit-like
opening of alimentary canal
Upper lip
Lower lip
Buccal Cavity
The mouth is
boarded by the
movable upper and
lower lips
Oral Cavity
13. DIGESTION AND ABSORPTION
The palate seperates the
ventral buccal cavity from
the dorsal nasal chamber
and facilitates chewing and
breathing simultaneously.
The anterior bony hard palate
is lined by palatine rugae .
The posterior soft
palate hangs down
into the pharynx is
called uvula.
The jawbones bear four kinds
of teeth and a tongue at the
base of the buccal cavity.
15. DIGESTION AND ABSORPTION
Teeth of human beings
are embedded in the
sockets of the jaw
bones, so they are
called Thecodont .
16. DIGESTION AND ABSORPTION
Majority of mammals
including human
beings form two sets of
teeth during their life
time
A set of temporary/milk
or deciduous teeth are
replaced by a set of
permanent or adult teeth.
Diphyodont teeth
17. DIGESTION AND ABSORPTION
Heterodont teeth
An adult human
has 32 permanent
teeth
four
different
types
Incisors(I)
Canines(C)
Premolars(PM)
Molars(M)
18. DIGESTION AND ABSORPTION
Human Dentition
Formula
i 2/2 c 1/1 pm 2/2 M 3/3
Total number of teeth in upper jaw is 16
Total number of teeth in lower jaw is 16
20. DIGESTION AND ABSORPTION
The arrangement of
different types of teeth in
each half of both the jaws in
the order I, C, PM, M is
represented by the
Dental formula
In adult humans it is
2 3
32
1 2
2 3
1 2
=
The dental formula of the
milk dentition of a baby
2 2
20
1 0
2 2
1 0
=
22. DIGESTION AND ABSORPTION
Crown is covered by a
white coating material
Enamel
Hardest
substance in
the body
Structure of tooth
Tooth has three parts namely
1) Crown - the exposed part
2) Neck- the middle part
3) Root -inner most part-embedded in the
socket of jaw bone
The bulk of a tooth is
formed by a hard
material called as
is secreted by odontoblasts,
of mesodermal origin.
Dentine
is secreted by
Ameloblasts of
ectodermal
origin.
23. DIGESTION AND ABSORPTION
A small cavity present inside
the tooth is called Pulp
cavity, which is filled with
pulp (nerves, blood, blood
vessels) and lined by a layer
of odontoblasts.
24. DIGESTION AND ABSORPTION
Dentine of the Root is
covered by Cementum.
The Root is fixed in the
socket (Alveolus) of the jaw
bone by cementum and
periodontal membrane.
The basal parts of the teeth
(Neck and Root) are covered by
the gums (gingiva).
25. DIGESTION AND ABSORPTION
Tongue Triangular shaped fleshy organ
Upper surface has projections
Pappillae
Taste buds
Mixes saliva with food
26. DIGESTION AND ABSORPTION
Tongue is a freely movable, muscular sense
organ, attached to the floor of the oral
cavity by a fold of tissue called Frenulum.
The upper surface of the tongue has
small projections called Papillae, some of
which bear Taste buds.
27. DIGESTION AND ABSORPTION
In humans the tongue bears three
types of papillae namely…
1)Fungiform:- at the anterior margin
and tip of tongue
2)Filiform :- on the surface of the
tongue
3)Circumvallate:- on the posterior
surface/base of
the tongue.
Circumvallate
28. DIGESTION AND ABSORPTION
The tongue acts as ‘ universal tooth brush’, and helps in mixing saliva
with food, taste detection, deglutition and speaking.
33. DIGESTION AND ABSORPTION
3) Laryngopharynx :- the lower
part
It is divided into three parts.
1) Nasopharynx: - lies above the
soft palate
2) Oropharynx :- the middle
part
Laryngopharynx
Eustachian tubes
from the middle ear
cavities open into the
nasopharynx.
35. DIGESTION AND ABSORPTION
Tonsils (Lymphoid tissue) present in the pharynx, include
1) Pharyngeal tonsils or Adenoids
2) A pair of Palatine tonsils
3) A pair of Lingual tonsils.
37. DIGESTION AND ABSORPTION
A muscular sphincter (gastro-
oesophageal/ cardiac sphincter )
regulates the opening between the
oesophagus and the stomach.
There is an upper oesophageal
sphincter at the beginning of the
oesophagus.
38. DIGESTION AND ABSORPTION
Food moves through the oesophagus
due to rhythmic contractions of
longitudinal and circular muscles.
Peristalsis Mucus is
secreted by
the epithelial
cells
Helps in smooth
passage of food
Oesophagus
39. DIGESTION AND ABSORPTION
1. Epiglottis is meant for protecting....
1) Oesophagus from entry of air
2) Nasal chambers from entry of food
4) Teeth from pathogens
3) Larynx from entry of food
43. DIGESTION AND ABSORPTION
STOMACH
“J” shaped
organ
25-30
cms
3 Parts
The stomach is a wide, J-shaped,
distensible bag like structure,
located in the upper left portion of
the abdominal cavity just below
the diaphragm.
44. DIGESTION AND ABSORPTION
Cardiac Fundus
Pyloric
3 Parts Cardiac stomach-- opens into oesophagus
Fundus stomach-- middle part
Pyloric stomach-- opens
into duodenum
Oesophagus
Duodenum
opens into the first part of
the small intestine through
the pyloric aperture which
is guarded by the pyloric
sphincter.
45. DIGESTION AND ABSORPTION
Both the ends of stomach have
SPHINCTERS
Cardiac
sphincter
Pyloric
sphincter
Cardiac sphincter-
anterior end at the opening of
oesophagus into the stomach
Pyloric Sphincter-
posterior end at the
opening of stomach into the
duodenum
46. DIGESTION AND ABSORPTION
Cardiac sphincter prevents
regurgitation of food
Pyloric sphincter regulates the passage
of food into the duodenum
47. DIGESTION AND ABSORPTION
SMALL INTESTINE Compactly coiled within
the abdominal cavity
6m
long
2.5cm
broad
The small intestine is
the longest part of the
alimentary canal.
48. DIGESTION AND ABSORPTION
Coils are held
together by a
connective tissue
membrane called
mesenteries
Mesentry
Mesentry provides
support for blood
vessels, lymph vessels,
& nerves
3 parts
52. DIGESTION AND ABSORPTION
Ileum
Ileum
Broader than jejunum
3.5 cm
Ileum opens into the large
intestine, and the opening
bears the ilio caecal valve and
a sphincter to prevent
backward flow of faecal
matter into the ileum.
53. DIGESTION AND ABSORPTION
1. The stomach takes part in....
1) Breaking food mechanically
2) Partially digesting the food
4) All the above
3) Disinfecting the food
56. DIGESTION AND ABSORPTION
Large Intestine
1.5 mts
Colon
Rectum
Ascending
Transverse
Descending
Mucus
secreting
cells
Caecum Caecum is a small
blind sac which
hosts some symboitic
microorganisms.
A narrow finger-like
tubular projections, the
vermiform appendix
(abdominal tonsil) which
is a vestigial organ,
arises from the caecum.
Colon shows the
external bulged out
pouches called Haustra
and three longitudinal
smooth muscle folds
called taenia coli.
57. DIGESTION AND ABSORPTION
Rectum Posterior region of
large intestine.
Undigested material
“faecal matter”
1.5 mts
Rectum is a small
dilated sac which
leads into anal canal
that opens out
through the anus.
Rectum is guarded by
internal anal sphincter
formed by smooth muscle
and external anal
sphincter formed by a
ring of voluntary, striped
muscle.
There is no
significant digestive
activity in the large
intestine.
It is concerned with
the absorption of
some water,
minerals and
certain drugs.
It secrets mucus which
helps in keeping the
undigested particles
together and lubricating
their passage to the
exterior.
58. DIGESTION AND ABSORPTION
1.5 mts
At the junction of
ilium & colon;
there is a blind
pouch
Caecum Elongated worm
like vermiform
appendix arises
from caecum.
Appendix
Appendix
59. DIGESTION AND ABSORPTION
1.5 mts
Anus Rectum opens to the
outside by anus;
guarded by a
sphincter.
Removes undigested
matter by
defaecation.
60. DIGESTION AND ABSORPTION
1. Ileum is characterized by.....
1) Brunner’s glands and leaf like villi
2) Brunner’s glands and club shaped villi
4) Peyer’s patches and Brunner's glands
3) Club shaped villi and peyer’s patches
62. DIGESTION AND ABSORPTION
Histology of alimentary canal
The wall of the alimentary canal from
the oesophagus to the rectum possesses
four layers
serosa
muscularis externa
sub mucosa
mucosa
63. DIGESTION AND ABSORPTION
Serosa
It is the outermost layer and is
made of a thin mesothelium
with some connective tissues.
Muscularis externa
sub mucosa
It is formed of loose connective
tissue containing nerves, blood
vessels and lymph vessels. Sub
mucosa of duodenum has
Brunner’s glands which
secrete mucus.
Mucosa
It is the innermost layer lining the
lumen of the alimentary canal. In
the mucosa of the small intestine
there are many microscopic
gastric glands. The mucosa of the
small intestine forms small folds
called Villi.
It is formed by smooth
muscle usually arranged
into outer longitudinal
and inner circular
muscles. An oblique
muscle layer may be
present in some regions
such as stomach
64. DIGESTION AND ABSORPTION
The columnar epithelial cells that line
the villi produce numerous microscopic
projections called Microvilli giving a
brush boarder appearance.
These modifications increase
the surface area of absorption.
Plasma membrane of microvilli bears
enzymes such as disaccharidases, which
are called brush border enzymes.
Each villus has a network of
capillaries and a large lymph
capillary called Lacteal .
Mucosal epithelium has goblet
cells which secret mucus, that
helps in the protection of the wall
from the action of the enzymes.
It also helps in the lubrication
of the passing food.
Mucosa of the small intestine forms crypts
of Lieberkuhn between the bases of villi.
65. DIGESTION AND ABSORPTION
1. Brush bordered enzymes are produced by plasma
membrane of …..
1) Small intestine
2) Oesophagus
4) Peyer’s patches and Brunner's glands
3) Microvilli
69. DIGESTION AND ABSORPTION
Digestive Glands
Salivary glands
Liver
Pancreas
Gastric glands
Intestinal glands
The digestive glands
present in the wall of the
alimentary canal are
Gastric glands,
Brunner’s glands, and
Crypts of Lieberkuhn.
The salivary glands, liver
and pancreas are the
digestive glands associated
with the gut (extra
alimentary canal glands).
70. DIGESTION AND ABSORPTION
Salivary glands
Sublingual
gland
Parotid
gland
Submandibular
gland
Sublingual gland- below the tongue
Submandibular gland- below the jaw
Parotid gland- in front of the ear
present below the pinna/inner surface
of the cheeks.
There are three pairs of
salivary glands in man.
71. DIGESTION AND ABSORPTION
Salivary glands 2 types of secretory cells
Serous cells
Mucus cells
Produce water, salts
Contains digestive enzyme
SALIVARY AMYLASE/
PTYALIN(α-amylase)
Produce mucus
Binds to food;
makes it slippery
Secretion of salivary
glands is called
SALIVA
Produce lysozyme
Kills bacteria
73. DIGESTION AND ABSORPTION
Gastric glands Gastric glands are located in the wall of
the stomach beneath the surface.
Gastric glands are of three types namely :
Cardiac glands
Fundic /Oxyntic glands
Pyloric glands
Cardiac glands:-
Fundic /Oxyntic glands
Pyloric glands :-
secrete mucus for
protection
secrete mucus
and the hormone
Gastrin
mucus neck cells
secrete
mainly
mucus
secrete large quantities
of the proenzymes…
pepsinogen, prorennin
peptic/chief cells
oxyntic/parietal cells
Secrete hydrochloric acid
and castle’s Intrinsic
Factor essential for the
absorption of vitamin B12..
Secretion of all these glands
form the “gastric juice” with
the Ph ranging from 0.9 to
1.8. Chief cells of gastric
glands also secrete some
amount of Gastric lipase.
74. DIGESTION AND ABSORPTION
They are of two types
1)Brunner’s glands
2)Crypts of Lieberkuhn.
secrete mucus
The secretion of Brunner’s glands
along with that of Crypts of
Lieberkuhn constitutes the intestinal
juice or succus entericus, with the
pH ranging from 7.5 to 8.0.
Succus entericus contains
peptidases such as tripeptidases,
dipeptidases, aminopeptidases
and disaccharidases such as
Sucrase (Invertase), Maltase,
and Lactase.
It also has small amount of
Intestinal Lipase and the
enzyme activator called
Enterokinase.
Paneath cells lining the bases of
the intestinal glands secrete
Lysozyme which kills the bacteria
that escape destruction in the
stomach.
NOTE: The intestinal wall has some ‘Stem cells’
which play an important role in renewing the
epithelial cells lost in the intestinal epithelium.
The Paneath cells are believed to play an
important role in the protection of these cells.
Intestinal glands
77. DIGESTION AND ABSORPTION
Largest gland
of our body
Dark reddish
brown
1.2 - 1.5
kgs
Liver
RIGHT LOBE LEFT LOBE
Situated in the abdominal
cavity just below the
diaphragm towards the right
side and has two lobes
78. DIGESTION AND ABSORPTION
Liver
Each liver lobe is formed
of hexagonal hepatic
lobules, surrounded by a
thin connective tissue
sheath called the Glisson’s
capsule.
The bile secreted by hepatic cells passes
through the hepatic ducts and is stored
as well concentrated in a thin muscular
sac called the Gall Bladder.
The hepatic lobules are the
structural and the functional
units of the liver, containing
hepatic cells arranged in the
form of Hepatic cords present
around a central vein.
79. DIGESTION AND ABSORPTION
Capsule
The hepatic lobules are the structural and the functional units of
the liver, containing hepatic cells arranged in the form of hepatic
cord.
80. DIGESTION AND ABSORPTION
Cells of liver
produce bile juice
Bile juice is stored in a
bag like structure
called Gall Bladder
Gall Bladder
81. DIGESTION AND ABSORPTION
The duct of the gall bladder (cystic duct) along with the common
hepatic duct from the liver forms the common bile duct.
The common hepatic duct and the cystic
duct form the common bile duct (CBD).
The Common hepatic duct is joined by the
pancreatic duct close to the ampulla of Vater.
These openings are
guarded by a sphincter
called Sphincter of Oddi.
82. DIGESTION AND ABSORPTION
Functions of liver
1) Liver is the chief organ of detoxification of toxic
substances that enter the gut along with food.
2) Liver acts as thermoregulatory organ like skeletal muscle, liver
too takes part in thermogenesis as it has high glucose (in the form
of glycogen) at its disposal.
3) Liver acts as a haemopoietic organ in the foetus and erythroclastic
organ in the adult (along with the spleen).
83. DIGESTION AND ABSORPTION
4) Liver secretes bile juice (yellowish-green in colour). It does not
contain enzymes, but it contains bile salts such as glycocholates and
taurocholates of sodium and potassium and ‘bile pigments’ the
bilirubin and biliverdin (formed by the breakdown of haemoglobin
of the old RBC destroyed in the body).
5) Liver plays the ‘key role’ in carbohydrate metabolism (glycogenesis,
glycogenolysis, gluconeogenesis and lipogenesis).
84. DIGESTION AND ABSORPTION
6) Liver also plays a role in lipid metabolism (synthesis of cholesterol
and production of triglycerides).
7) Deamination of proteins (removal of NH2 group from the amino
acids) and conversion of ammonia into urea(via the ornithine cycle).
8) The lactic acid formed during anaerobic muscle contraction is
converted into glucose (gluconeogenesis) in the liver by cori cycle.
85. DIGESTION AND ABSORPTION
9) Liver synthesizes the plasma proteins such as albumins, globulins,
blood clotting factors such as fibrinogen, prothrombin, and the
anticoagulant called heparin.
10) Kupffer’s cells (the large phagocytic cells) remove unwanted
substances and microbes that attack the liver by phagocytosis.
They are present in the sinusoids that lie in between hepatic cords
and they are also called hepatic macrophages.
86. DIGESTION AND ABSORPTION
Liver secretes bile
Bile emulsifies fats &
makes food alkaline
Liver stores excess
glucose in the form
of glycogen
Used during
starvation
Functions of liver
87. DIGESTION AND ABSORPTION
Excess amino acids
Converted into
NH3
Deamination
Synthesizes
Vit A, D, K, B12
Blood proteins like
Prothrombin &
Fibrinogen are formed
Produces RBC during
early development;
hence works as a
haemopoetic organ.
Deamination of proteins
(removal of NH2 group from
the amino acids) and
conversion of ammonia into
urea by the Ornithine cycle).
88. DIGESTION AND ABSORPTION
In the case of alcoholics, liver detoxifies
alcohol to some extent before it is sent into
general circulation. That is why liver is the
first and most affected organ in chronic
alcoholism (cirrhosis) .This is the reason
behind development of liver cancers by
certain fungal toxins, produced by
organism such as Aspergillus flavus . After
entering the body the aflatoxins are
generally metabolised by the liver into
some other non-toxic substances.
90. DIGESTION AND ABSORPTION
Leaf shaped gland
lying in between
duodenum and
stomach endocrine
exocrine
MIXED
GLAND
Pancreas is the second
largest gland in human
body. It is a mixed
(compound) gland situated
between the limbs of “U”
shaped duodenum.
91. DIGESTION AND ABSORPTION
Exocrine part is
made of
pancreatic lobules
Exocrine Acini
Acini
Flask shaped &
formed of single
layer of large
glandular
pyramid shaped
cells
Pancreatic
juice
Exocrine part of pancreas, the
pancreatic acini secrete alkaline
pancreatic juice (pH 8.4)
containing enzymes and the
endocrine part, the islets of
Langerhans which secrete insulin,
glucagon and other hormones
92. DIGESTION AND ABSORPTION
1. Liver performs the function of......
1) Glycogenesis
2) Glycogenolysis
4) All the above
3) Deamination
93. DIGESTION AND ABSORPTION
2. The process which converts excess amino acids into
ammonia is called….
1. Ammonotelism
2. Deamination
3. Both of the above
4. None of the above
94. DIGESTION AND ABSORPTION
3.Pancreas is associated with.....
1) Digestive glands
2) Peyer’s patches
4) Gastric glands
3) islets of Langerhans
98. DIGESTION AND ABSORPTION
Digestion is the process of conversion of complex non-diffusible
food substances into simple diffusible forms.
The process of digestion is accomplished by mechanical (cutting and
chewing of food by teeth and churning of food by peristalsis) and
chemical (enzymatic reactions by hydrolysing enzymes) process.
99. DIGESTION AND ABSORPTION
Food eaten is
insoluble
To be
utilized by
the body…
Undergoes
PHYSICAL &
CHEMICAL
changes
Converted into
simple, soluble,
absorbable form
Absorbed by the
cells of the
digestive tract
Diffused into
blood
101. DIGESTION AND ABSORPTION
Digestion in the BUCCAL CAVITY
Food is broken
into small pieces Mastication,
Chewing etc.
Teeth and Tongue
mix food with
saliva (salivary
glands)
Saliva converts
the food into a
paste
Enzyme Salivary
Amylase/Ptyalin present in
saliva acts on starch
Converts starch
into Maltose
Buccal cavity performs two
major functions, mastication
of food and facilitation of
swallowing (deglutition).
Mucus in saliva helps in
lubricating and
adhering the masticated
food particles into a
bolus.
The saliva secreted into
oral cavity contains
electrolytes such as Na+,
K+,Cl+,HCO3
- and
enzymes, such as Salivary
amylase (Ptyalin) and
Lysozyme.
102. DIGESTION AND ABSORPTION
The chemical process of digestion is initiated in the oral cavity
(buccal cavity) by the hydrolytic action of carbohydrate (starch)
splitting enzyme, the salivary amylase .
Ph = 6.8
Starch Maltose
Salivary amylase
About 30% of starch is hydrolyzed into a disaccharide called
maltose by the enzyme ptyalin. Lysozyme present in the saliva acts
as antibacterial agent that prevents infections.
103. DIGESTION AND ABSORPTION
Starch
Salivary Amylase
Maltose
(Polysaccharide) (Disaccharide)
Round
food ball
Bolus
Oesophagus By the
tongue
Tongue
Presses against
Palate
Pharynx
DEGLUTITION
104. DIGESTION AND ABSORPTION
PERISTALSIS Rhythmic wave of
contractions &
relaxations in any
tubular organ
Peristalsis
Internal organs are lined
by smooth muscles which
bring about this
movement slowly
105. DIGESTION AND ABSORPTION
DIGESTION IN THE STOMACH
Gastric glands
produce gastric juice
as soon as food
enters into stomach
Gastric juice:
• Dilute HCl;
• Mucus;
• Inactive protein
digesting enzyme-
Pepsinogen
Stomach stores the food for 4-5
hours. The food is mixed thoroughly
with the acidic gastric juice of the
stomach by the churning of its
muscular wall and the product is
called Chyme.
106. DIGESTION AND ABSORPTION
Stomach churns the food by
strong peristaltic movements
PHYSICAL
DIGESTION
Food gets properly mixed
with the gastric juice
produced in the stomach
107. DIGESTION AND ABSORPTION
Functions of HCl
Stops the action of
Salivary Amylase
Provides the acidic
medium required to
convert inactive
pepsinogen to active
pepsin
Kills germs that
may enter along
with food
Helps to
soften food
HCl provides the acidic pH (1.8) which is
optimal for the action of pepsin. It also
kills the microorganisms ingested along
with food. The proenzymes of gastric
juice, the Pepsinogen and prorenin, on
exposure to HCl are converted into the
active enzymes, pepsin and rennin.
108. DIGESTION AND ABSORPTION
Pepsin acts on proteins
and converts them to
peptones and proteases
Pepsinogen
HCl
Pepsin
Active enzyme
Inactive enzyme
Proteins
Pepsin Peptones &
Proteases
Acidic medium
Pepsin can convert pepsinogen
into pepsin (autocatalysis).
109. DIGESTION AND ABSORPTION
Rennin is a proteolytic enzyme found in the gastric juice of infants.
Rennin acts on the milk protein, the Casein in the presence of
calcium ions and converts it into calcium paracaseinate (curdling of
milk) and proteases.
Prorennin (inactive) Rennin (active)
HCl
Casein Calcium paracaseinate
Ca+2
Pepsin acts on calcium paracaseinate & converts it into peptones.
Ca+ paracaseinate
Pepsin
Peptones
110. DIGESTION AND ABSORPTION
Certain other cells in the wall of the stomach produce bicarbonate,
a base to buffer the acidic contents of the stomach.
The mucus produced by the wall of the stomach forms a physical
barrier to prevent HCl from damaging the wall of the stomach.
111. DIGESTION AND ABSORPTION
1.The other name of chewing is …..
a. Mastication
b. Churning
c. Ingestion
d. None of the above
113. DIGESTION AND ABSORPTION
Various types of movements are generated by the muscularis
externa layer of the small intestine.
These movements help in thorough mixing up of the food with bile,
pancreatic juice and intestinal juice in the intestine and thereby
facilitate digestion.
The mucus along with the bicarbonates from pancreas protects the
intestinal mucosa from the acidic medium and provides alkaline
medium (pH 7.8) for enzymatic activities.
114. DIGESTION AND ABSORPTION
The duodenal cells of the proximal part also produce large
amount of bicarbonates to completely neutralize any gastric acid
that passes further down into the digestive tract.
All the enzymes of the pancreatic juice and succus entericus act
only in alkaline medium.
115. DIGESTION AND ABSORPTION
Inactive trypsinogen is converted into trypsin
by enterokinase from intestinal juice.
Trypsinogen
enterokinase
Trypsin
Alkaline medium
Trypsinogen,
chymotrypsinogen and
procarboxy peptidases are
inactive enzymes.
Trypsin itself can similarly activate Trypsinogen into Trypsin.
(Autocatalysis)
Trypsinogen
trypsin
Trypsin
116. DIGESTION AND ABSORPTION
Chymotrypsinogen is converted into active chymotrypsin by trypsin
Chymotrypsinogen Chymotrypsin
inactive active
trypsin
Trypsin acts on proteins, peptones, and proteases to form polypeptides.
Proteins + Peptones + Proteases
Trypsin
Polypeptides
117. DIGESTION AND ABSORPTION
Proteins
Proteoses
Peptones
Trypsin/chymotrypsin
Carboxypeptidase, aminopeptidase
+
Tripeptides Dipeptides
Tripeptides
Tripeptidase
Dipeptides Amino acids
+
Dipeptides
Dipeptidase
Amino acids
Thus the end product of
digestion of proteins
namely amino acids are
formed in the small
intestine.
Proteins, proteoses and peptones
(partly hydrolyzed proteins) in the
chyme reaching the intestine are
acted upon by the proteolytic
enzymes of the pancreatic juice and
intestinal juice as shown below:
118. DIGESTION AND ABSORPTION
Digestion of fats
Bile salts of the bile help in
the emulsification of fats
break down of fats into
very small micelles.
Bile also activates lipases of
pancreatic juice (stepsin) and
intestinal lipases. These
lipases act on emulsified fats
and convet them into fatty
acids and glycerols.
Emulsified fats are converted into micelles by bile salts
Fats Bile salts Emulsified fats
Emulsified fats
Lipase Diglycerides
Diglycerides Lipase Monoglycerides
Monoglycerides
Lipase Fatty acids
Glycerol
+
119. DIGESTION AND ABSORPTION
Digestion of Carbohydrates
Carbohydrates in the chyme are hydrolysed by the pancreatic
amylase into disaccharides. Intestinal disaccharidases act on the
‘disaccharides’and convert them into monosaccharides.
Carbohydrates
Amylase
Maltose
Alkaline medium
Sucrose
Lactose
+
+
120. DIGESTION AND ABSORPTION
Maltase acts on maltose to form glucose
Maltose
maltase
Glucose Glucose
+
Sucrase acts on sucrose to form fructose and glucose
Sucrose
Sucrase
Glucose Fructose
+
Lactase acts on lactose to form glucose and galactose
Lactose
lactase
Glucose Galactose
+
121. DIGESTION AND ABSORPTION
Nucleic acids
Nucleases
Nucleotides
Nucleotides
Nucleotidases
Nucleosides + phosphates
Nucleosides
Nucleosidases
Sugars + Bases
DNA,RNA DNase,RNase
Nucleases (DNAase,
RNAase) of the pancreatic
juice act on the nucleic acids
to form nucleotides and
nucleosides.
Nucleotidases and
nucleosidases of the intestinal
juice convert the
nucleotides and nucleosides
into pentose sugars and
nitrogen bases.
Digestion of nucleic acids
122. DIGESTION AND ABSORPTION
PERISTALSIS
Rhythmic wave of
contractions &
relaxations in any
tubular organ
Peristalsis
Internal organs are
lined by smooth
muscles which
bring about this
movement slowly
123. DIGESTION AND ABSORPTION
It involves contraction and relaxation of smooth muscles of the wall
of the gut, resulting in successive wave like movements throughout
the gut.
It causes propulsion of food through
different parts of the gut and its exposure
to efficient enzymatic action.
Bolus of the food formed in the buccal
cavity is conveyed into pharynx and then
into the oesophagus by swallowing or
deglutition.
124. DIGESTION AND ABSORPTION
The bolus further passes down through the
oesophagus by successive waves of muscular
contractions called peristalsis.
Usually peristaltic movements are initiated
from oesophagus and are continued upto the
rectum.
However, the sphincters associated with the
gut regulate the passage of food through
different parts of the gut.
125. DIGESTION AND ABSORPTION
Peristaltic movements of the stomach (churning movements) are so
powerful that they can cause mechanical digestion.
Peristaltic movements of the intestine are slow. Stimulation from
the parasympathetic nervous system-increases the peristaltic
movements of the gut and relaxes the sphincter (made of smooth
muscles).
131. DIGESTION AND ABSORPTION
Absorption is the process by which the end products of digestion
pass through the intestinal mucosa into blood or lymph. It is
carried out by passive, active or facilitated transport mechanisms.
Monosaccharides such as glucose and galactose are transported
into the cells of the villi via secondary active transport (SAT),
coupled with Na+ and from there into blood by Facilitated
Diffusion.
132. DIGESTION AND ABSORPTION
Substances such as fructose is absorbed by Facilitated Diffusion.
From the intestinal epithelial cells, it is transported into blood by FD.
Transport of water depends upon the osmotic gradient.
Amino acids are actively transported or by Secondary Active
Transport with Na+ and from there they enter blood capillaries by
Facilitated Diffusion.
Short chain fatty acids 'diffuse' into the intestinal epithelial cells and
blood capillaries.
133. DIGESTION AND ABSORPTION
Long chain fatty acids and glycerol, being insoluble in water cannot
be absorbed into the blood directly.
They are first modified into small droplets called micelles, which
enter the intestinal mucosal cells by diffusion.
In the intestinal epithelial cells they are formed into very small
protein coated fat globules called chylomicrons.
These chylomicrons are transported into the lacteals (lymph
capillaries) in the villi by exocytosis (they cannot enter the blood
capillaries due to their large size).
134. DIGESTION AND ABSORPTION
Lymph vessels ultimately release the absorbed substances into the
blood stream through the left subclavial vein via thoracic duct.
These chylomicrons (triglycerides) are broken down to fatty acids
and glycerol by the action of the enzyme lipoprotein lipase present in
the endothelial walls and they diffuse into adipocytes of the adipose
tissue, and liver for storage (as neutral fat/ tissue fat).
Vitamins are generally absorbed by simple diffusion. Vitamin B12 is
actively reabsorbed in combination with castle’s intrinsic factor.
135. DIGESTION AND ABSORPTION
Absorption of substances takes place in different parts of the gut,
like mouth, stomach, small intestine, large intestine.
However, maximum absorption of the end products of digestion
occurs in the small intestine.
136. DIGESTION AND ABSORPTION
Mouth Stomach Small Intestine Large Intestine
Certain drugs
coming in contact
with the mucosa
of mouth and
lower side of the
tongue are
absorbed into the
blood capillaries
lining them.
Absorption of
simple sugars,
alcohol and
drugs etc.
takes place.
Principal organ
for absorption of
nutrients.
Absorption of
water, some
minerals and
drugs takes
place.
The digestion completed here and the
final products of digestion such as
glucose, fructose, galactose, amino
acids are absorbed into blood through
mucosa whereas fatty acids and
glycerols are absorbed through the
mucosa into lymph of the lacteals.
137. DIGESTION AND ABSORPTION
Assimilation
The absorbed substances finally reach the tissues where food
materials become integral components of the living protoplasm are
used for the production of energy, growth and repair. This process is
called assimilation.
Defaecation
The undigested, unabsorbed substances are passed on to the large
intestine. No significant digestive activity occurs in the large
intestine.
138. DIGESTION AND ABSORPTION
Absorption of some water, minerals and certain drugs.
Secretion of mucus which helps in holding the undigested
particles together and lubricating it for easy passage.
The undigested and unabsorbed substances which mostly include
fiber of plant material generally called roughage enters the large
intestine.
The functions of large intestine are….
139. DIGESTION AND ABSORPTION
Water and some useful substances are reabsorbed in it. It is
temporarily stored in the rectum till it is expelled out through the
anus (defaecation).
The undigested wastes, solidified into faeces in the rectum, initiate a
neural reflex causing an urge for its removal.
The egestion of faeces to the outside through the anal opening is
voluntary process and it is carried out by a mass peristaltic
movement’.
140. DIGESTION AND ABSORPTION
1. Large intestine helps in the absorption of …..
1) Vitamins
2) Proteins
4) Fats
3) Carbohydrates
142. DIGESTION AND ABSORPTION
GASTRO INTESTINAL HORMONES
Activities of the gastro intestinal tract are under neural and
hormonal control for proper coordination of different parts.
The sight, smell and the presence of the food in the oral cavity can
stimulate the secretion of saliva.
Gastric and intestinal secretions are also similarly stimulated by
neural signals.
143. DIGESTION AND ABSORPTION
The muscular activities of different parts of the alimentary canal are
also moderated by neural mechanisms.
Hormonal control of the secretions of digestive juices is carried out
by the local hormones by gastric and intestinal mucosa as given
below.
144. DIGESTION AND ABSORPTION
Gastrin is secreted from the epithelium of the stomach, it
stimulates the secretion of HCl and pepsinogen.
Enterogastrone (or) gastric inhibitory peptide(GIP) is
secreted by the epithelium of duodenum due to the effect
of dietary lipids. It inhibits gastric secretion and gastro-
intestinal motility.
145. DIGESTION AND ABSORPTION
Cholecystokinin(CCK)/Cholecystokinin – pancreozymin/
pancreozymin is secreted from the epithelium of the
duodenum, acts on pancreas and gallbladder and stimulate
the secretion of pancreatic enzymes and release of bile.
Secretin is secreted by the epithelium of duodenum &
acts on the pancreatic acini; Stimulates the secretion of
water & bicarbonates of the pancreatic juice.
146. DIGESTION AND ABSORPTION
Enterocrinin secreted from the duodenal mucosa stimulates the
secretions of succus entericus, villikinin secreted from intestinal villi,
stimulates the movements of villi to increase absorption.
NOTE:
147. DIGESTION AND ABSORPTION
Carbohydrates
Organic Compounds composed of
C
H
O
Cheapest source
of energy
1gm of Carbohydrate
4 Kcal
of
Energy
CALORIFIC VALUES OF CARBOHYDRATES,
PROTEINS AND FATS
149. DIGESTION AND ABSORPTION
Fats /
Lipids
Highly conc. energy
foods
1gm of Fat
9.5 Kcal
of
Energy
Obtained from buttercream, oils,
nuts, fish, etc.
Organic Compounds composed of:
C
H
O
153. DIGESTION AND ABSORPTION
The inflammation of the intestinal tract is the most common ailment
due to bacterial or viral infections.
The infections are also caused by the parasites of the intestine such
as tape worm, round worm, thread worm, hook worm, pin worm.
DISORDERS OF THE DIGESTIVE SYSTEM
154. DIGESTION AND ABSORPTION
The liver is affected (hepatitis): Anorexia
(lack of appetite) is a common symptom.
Skin and white part of the eye balls turn
yellow due to deposition of bile pigments.
Jaundice
155. DIGESTION AND ABSORPTION
Vomiting
It is the “throwing out” of the contents of the stomach through
the mouth.
This reflex action is controlled by the “vomiting centre” in the
medulla oblongata. A feeling of nausea precedes vomiting.
156. DIGESTION AND ABSORPTION
Diarrhoea
The abnormal frequency of bowl movement and increased liquidity
of the faecal discharge is known as diarrhoea.
It reduces the absorption of food and results in loss of water
(dehydration).
157. DIGESTION AND ABSORPTION
Constipation
In constipation the faeces retained within the
rectum as it is hard due to low content of water
and the movement of the bowel occurs
irregularly.
Indigestion
In this condition, food is not properly digested
leading to a feeling of “fullness”. The causes of
indigestion are mostly “spicy foods”, “overeating”
and “anxiety”.
158. DIGESTION AND ABSORPTION
1. The abnormal frequency of bowl movement and increased
liquidity of the faecal discharge is called …..
1) Vomiting
2) Constipation
4) Jaundice
3) Diarrhoea