The document summarizes the human digestive system in three stages: 1) Ingestion of food through the mouth and esophagus to the stomach. 2) Digestion of food through stomach acids and enzymes and mixing with bile and pancreatic juices in the small intestine. 3) Absorption of nutrients in the small intestine and removal of waste in the large intestine and rectum. The digestive, circulatory, nervous and endocrine systems work together through hormones and signals to break down and absorb nutrients from food while eliminating waste.
Digestive System of the Human Body.
Detailed explaination.
According to ICSE syllabus for grade 9.
This Presentation includes: The alimentary canal, organs and their functions, secretions, processes and definitions.
Based on selina publishers- Biology Part 1 grade 9.
This lecture illustrates the basics of the digestive system and the roles each section within the GI tract plays in the digestion and absorption of our macro-nutrients
Digestive System of the Human Body.
Detailed explaination.
According to ICSE syllabus for grade 9.
This Presentation includes: The alimentary canal, organs and their functions, secretions, processes and definitions.
Based on selina publishers- Biology Part 1 grade 9.
This lecture illustrates the basics of the digestive system and the roles each section within the GI tract plays in the digestion and absorption of our macro-nutrients
Introduction to digestive system
Organs of digestive tract
Mouth and their different enzymes and actions
salivary glands
Oesophagus
Stomach
Small Intestine and funcions
Large Intestine and functions
Anus
Assessary Organs
Liver
Pancreas
Digestive system Physiology
Ingestion
Digestion
Absorption
Assimilation.
Excretion
An important system of our body is known as digestive system which has its own role to play. This step of digestion serves as as a next route to the steps of absorption of nutrients by the small intestine and its respective transportation to the cells and tissues. This slide focuses on the different organs of digestion and their functions .
This PowerPoint presentation details out the anatomy of the human digestive system. Their are general terminologies that involves the topic but over-all this work focuses on how digestion takes place in the human body. The details coming from this presentation are combined from four different and liable sources/references including Biology (Thomson Asian Edition). I can say that this presentation is brief and well-organized so I hope this could help you in your class or seminars. Thanks.
Lymphatic comes from the Latin word lymphaticus, meaning "connected to water," as lymph is clear.
Network of vessels & lymph nodes which are located in all major tissues of body
Introduction to digestive system
Organs of digestive tract
Mouth and their different enzymes and actions
salivary glands
Oesophagus
Stomach
Small Intestine and funcions
Large Intestine and functions
Anus
Assessary Organs
Liver
Pancreas
Digestive system Physiology
Ingestion
Digestion
Absorption
Assimilation.
Excretion
An important system of our body is known as digestive system which has its own role to play. This step of digestion serves as as a next route to the steps of absorption of nutrients by the small intestine and its respective transportation to the cells and tissues. This slide focuses on the different organs of digestion and their functions .
This PowerPoint presentation details out the anatomy of the human digestive system. Their are general terminologies that involves the topic but over-all this work focuses on how digestion takes place in the human body. The details coming from this presentation are combined from four different and liable sources/references including Biology (Thomson Asian Edition). I can say that this presentation is brief and well-organized so I hope this could help you in your class or seminars. Thanks.
Lymphatic comes from the Latin word lymphaticus, meaning "connected to water," as lymph is clear.
Network of vessels & lymph nodes which are located in all major tissues of body
Human digestive system structure and function
overview
Major organs
Mouth
Esophagus
Stomach
small intestine
large intestine
Acessory organs:
Liver
gall bladder
Pancreas.
Human digestive system
Major organs
Mouth
Esophagus
Stomach
small intestine
large intestine.
Acessory organs:
Liver
Gall bladder
Pancreas.
MAJOR ORGANSThe Mouth
pH: 7
The first part of the digestive system
the entry point of food.
Structures in the mouth that aids digestion
Teeth – cut, tear, crush and grind food.
Salivary glands – produce and secrete saliva into the oral cavity.
saliva
moistens the food
contains enzymes (ptyalin or salivary amylase)
begins digestion of starch into smaller polysaccharides.
Function:
Mechanical digestion.
increasing surface area for faster chemical digestion.
The Esophagus
a tube connecting the mouth to the stomach
running through the Thoracic cavity.
Location:
lies behind windpipe (Trachea).
The trachea has as an epiglottis
preventing food from entering the windpipe,
moving the food to the esophagus while swallowing.
Food travels down the esophagus, through a series of involuntary rhythmic contractions (wave-like) called peristalsis.
Function:
The lining of the esophagus secretes mucus
lubricating
to support the movement of food.
Esophageal sphincter:
bolus reaches the stomach
must pass through a muscular ringed valve called the esophageal sphincter (Cardiac Sphincter).
Function:
prevent stomach acids from back flowing into the esophagus.
Stomach
J-shaped muscular sac
Has inner folds (rugae)
Increasing surface area of the stomach.
Function:
Stomach performs mechanical digestion
HOW By churning the bolus and mixing it with the gastric juices
secreted by the lining of the stomach.
GASTRIC JUICES HCl, salts, enzymes, water and mucus)
HCL helps break down of food and kills bacteria that came along with the food.
The bolus is now called Chyme.
Enzymes in stomach:
Acidic environment
HCl secreation
kill any microbes that are found in the bolus,
creating a pH of 2.
Mucus prevents the stomach from digesting itself.
Pepsin secreation
responsible for initiating the breakdown of proteins (in )food.
hydrolyzes proteins to yield polypeptides.
pH is 2, the enzyme from the salivary glands stops breaking down carbohydrates.
Pyloric sphincter:
chyme moves from the stomach to the small intestine.
It passes through a muscular ringed sphincter called the pyloric sphincter.
stomach does not digest itselfWhy ?
Protective Mechanism:
three protective mechanisms.
First the stomach only secretes small amounts of gastric juices until food is present.
Second the secretion of mucus coats the lining of the stomach protecting it from the gastric juices.
The third mechanism is the digestive enzyme pepsin is secreted in an inactive protein c
Anatomy and Physiology of Digestive system.
Different Digestive process for absorption of food in GIT.
Different parts GIT Tract where food move from Mouth to the anus.
With this presentation we will learn to develop an understanding of the relationships between the structures and functions of the human digestive system and digestive processes which include the processes of digestion include six activities: ingestion, propulsion, mechanical or physical digestion, chemical digestion, absorption, and defecation
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The digestive system
1.
2. Introduction
The digestive system is
used for breaking down
food into nutrients
which then pass into the
circulatory system and
are taken to where they
are needed in the body.
3. Introduction
There are four stages to
food processing:
1. Ingestion: taking in food
2.Digestion: breaking down
food into nutrients
3. Absorption: taking in
nutrients by cells
4.Egestion: removing any
leftover wastes
4. The Human Digestive System
Begins when food enters
the mouth.
It is physically broken
down by the teeth.
It is begun to be
chemically broken down
by amylase, an enzyme
in saliva that breaks
down carbohydrates.
5. The Human Digestive System
The tongue moves the
food around until it
forms a ball called a
bolus.
The bolus is passed to
the pharynx (throat) and
the epiglottis makes sure
the bolus passes into the
esophagus and not down
the windpipe!
6. The Human Digestive System
The bolus passes down
the esophagus by
peristalsis.
Peristalsis is a wave of
muscular contractions
that push the bolus
down towards the
stomach.
7. The Human Digestive System
To enter the stomach,
the bolus must pass
through the lower
esophageal sphincter, a
tight muscle that keeps
stomach acid out of the
esophagus.
8. The Human Digestive System
The stomach has folds
called rugae and is a big
muscular pouch which
churns the bolus
(Physical Digestion) and
mixes it with gastric
juice, a mixture of
stomach acid, mucus
and enzymes.
9. The Human Digestive System
The acid kills off any
invading bacteria or
viruses.
The enzymes help break
down proteins and
lipids. Chemical
Digestion.
The mucus protects the
lining of the stomach
from being eaten away
by the acid.
10. The Human Digestive System
The stomach does do
some absorption too.
Some medicines (i.e.
aspirin), water and
alcohol are all absorbed
through the stomach.
The digested bolus is
now called chyme and it
leaves the stomach by
passing through the
pyloric sphincter.
11. The Human Digestive System
Chyme is now in the
small intestine.
The majority of
absorption occurs here.
The liver and pancreas
help the small intestine
to maximize absorption.
The small intestine is
broken down into three
parts:
12. The Human Digestive System
1. Duodenum
Bile, produced in the
liver but stored in the
gall bladder, enters
through the bile duct.
It breaks down fats.
The pancreas secretes
pancreatic juice to
reduce the acidity of
the chyme.
13. The Human Digestive System
2. Jejunum
The jejunum is where
the majority of
absorption takes place.
It has tiny fingerlike
projections called villi
lining it, which
increase the surface
area for absorbing
nutrients.
14. The Human Digestive System
Each villi itself has tiny fingerlike projections called
microvilli, which further increase the surface area
for absorption.
15. The Human Digestive System
3. Ileum
The last portion of the
small intestine is the
ileum, which has fewer
villi and basically
compacts the leftovers
to pass through the
caecum into the large
intestine.
16. The Human Digestive System
The large intestine (or
colon) is used to absorb
water from the waste
material leftover and to
produce vitamin K and
some B vitamins using
the helpful bacteria that
live here.
17. The Human Digestive System
All leftover waste is
compacted and stored at
the end of the large
intestine called the
rectum.
When full, the anal
sphincter loosens and
the waste, called feces,
passes out of the body
through the anus.
18. Digestion and Homeostasis
The endocrine, nervous,
digestive and circulatory
systems all work
together to control
digestion.
Before we eat, smelling
food releases saliva in
our mouths and gastrin
in our stomachs which
prepares the body for a
snack.
The Hormone Gastrin
19. Digestion and Homeostasis
A large meal activates
receptors that churn the
stomach and empty it
faster.
If the meal was high in
fat, digestion is slowed,
allowing time for the fat
to be broken down.
Hence why we feel fuller
after eating a high fat
meal.