The document discusses pancreatic secretions and their regulation. The pancreas secretes digestive enzymes like lipase, amylase, and proteases in inactive forms. Trypsinogen is activated to trypsin in the small intestine by enterokinase. Pancreatic secretions are regulated by vagus nerves, cholecystokinin (CCK), and secretin. CCK stimulates enzyme secretion while secretin stimulates bicarbonate secretion. Bile is also discussed, including its role in fat digestion, composition, and enterohepatic circulation of bile salts. Secretions of the small intestine, including enzymes on the brush border, are also summarized briefly.
Enteric nervous system - GIT physiology, EXTRINSIC AND INTRINSIC NERVE SUPPLY, Meissner's and myenteric's plexus.
local reflex, short reflex. Parasympathetic and sympathetic nerve supply of GIT. Functions of the plexuses.
Thyroid hormone (The Guyton and Hall physiology)Maryam Fida
THYROID HORMONE
Location:
The thyroid gland located below the larynx on each side of and anterior to the trachea.
Largest Endocrine Hormone
Secretion:
secretes:
1. thyroxine (T4)
2. triiodothyronine (T3)
3. Also secretes calcitonin (an important hormone for calcium metabolism)
Cell: Thyrotopes
secretion is controlled by thyroid-stimulating hormone (TSH) from the anterior pituitary gland.
93% T4 & 7% T3
T4→T3 in tissues
Qualitatively same
Differ in Rapidity & Intensity of action.
T3 is 4 times more potent than T4, but decrease conc. In blood & decrease half life.
T3 and T4 combine mainly with thyroxine-binding globulin.
More than 90% of Thyroid hormone that binds with cellular receptors is T3.
T4
No effect for 2-3 days after injection
Long Latent Period.
Activity peaks in 10-12 days & ↓↓ with a half life of 15 days.
In some cases it takes 6 weeks-2 months.
T3
4 times rapid
Latent Period 6-12 hours
Peak in 2-3 days
Composed of large numbers of closed follicles filled with colloid and lined with cuboidal epithelial cells that secrete into the interior of the follicles
The major component of colloid is the large glycoprotein Thyroglobulin contains the thyroid hormones within its molecule.
50mg/year, 1mg/week
Ingested iodine in the form of iodides
Iodides ingested orally are absorbed from GIT
⅕ removed from the blood by thyroid cells for synthesis of hormones; rest excreted through kidneys.
Basal membrane of thyroid cells has an active pump to push iodides to interior (Iodine Pump).
Normally 30% more conc. Inside
Max. active 250% more conc. Inside
The rate of Iodine trapping is influenced by conc. of TSH
TSH stimulates and hypophysectomy greatly diminishes the activity of the iodide pump in thyroid cells.
The Ultimate Guide to Understanding the Human Digestive SystemDeepanshuYadav2
Human Digestive System: Unraveling the Intricacies of our Inner Factory
Introduction
Welcome to this comprehensive guide on the human digestive system! In this article, we will embark on a fascinating journey through the intricacies of our inner factory, exploring the processes and functions that allow our bodies to break down and absorb nutrients from the food we consume. Join us as we unravel the secrets of digestion, absorption, and elimination, shedding light on the marvelous mechanism that keeps us nourished and energized.
The Human Digestive System: An Overview
The human digestive system is a complex network of organs and processes that work together to facilitate the digestion and absorption of food. From the moment we take a bite to the final elimination of waste, this remarkable system ensures that our bodies receive the vital nutrients needed for growth, repair, and maintenance.
The Mouth: Where It All Begins
The journey of digestion commences in the mouth. As food enters our oral cavity, it undergoes the first stage of mechanical digestion through the process of chewing. The teeth break down the food into smaller pieces, increasing its surface area for efficient chemical digestion. The saliva, secreted by the salivary glands, also plays a crucial role by moistening the food and initiating the breakdown of complex carbohydrates with the enzyme amylase.
The Esophagus: A Pathway to the Stomach
Once food is sufficiently chewed and mixed with saliva, it travels down the esophagus, a muscular tube connecting the mouth to the stomach. Through rhythmic contractions known as peristalsis, the esophagus propels the food downward, allowing it to reach the stomach for further processing.
The Stomach: A Gastric Playground
The stomach serves as a temporary reservoir for food and facilitates both mechanical and chemical digestion. It churns and mixes the food with gastric juices, including hydrochloric acid and enzymes such as pepsin. This powerful combination breaks down proteins and kills harmful bacteria, preparing the food for the next phase of digestion.
The Small Intestine: The Hub of Absorption
The small intestine is where the magic of absorption truly takes place. Divided into three parts—the duodenum, jejunum, and ileum—it receives the partially digested food from the stomach. The walls of the small intestine are lined with finger-like projections called villi, which increase the surface area for nutrient absorption. Here, the nutrients are broken down into their smallest forms and are transported into the bloodstream for distribution to the body's cells.
The Large Intestine: Processing Waste
As the now-depleted food mass enters the large intestine, the focus shifts from digestion to waste processing. The large intestine absorbs water and electrolytes from the remaining undigested material, forming solid waste known as feces. The feces are then stored in the rectum until elimination through the anus occurs.
Enteric nervous system - GIT physiology, EXTRINSIC AND INTRINSIC NERVE SUPPLY, Meissner's and myenteric's plexus.
local reflex, short reflex. Parasympathetic and sympathetic nerve supply of GIT. Functions of the plexuses.
Thyroid hormone (The Guyton and Hall physiology)Maryam Fida
THYROID HORMONE
Location:
The thyroid gland located below the larynx on each side of and anterior to the trachea.
Largest Endocrine Hormone
Secretion:
secretes:
1. thyroxine (T4)
2. triiodothyronine (T3)
3. Also secretes calcitonin (an important hormone for calcium metabolism)
Cell: Thyrotopes
secretion is controlled by thyroid-stimulating hormone (TSH) from the anterior pituitary gland.
93% T4 & 7% T3
T4→T3 in tissues
Qualitatively same
Differ in Rapidity & Intensity of action.
T3 is 4 times more potent than T4, but decrease conc. In blood & decrease half life.
T3 and T4 combine mainly with thyroxine-binding globulin.
More than 90% of Thyroid hormone that binds with cellular receptors is T3.
T4
No effect for 2-3 days after injection
Long Latent Period.
Activity peaks in 10-12 days & ↓↓ with a half life of 15 days.
In some cases it takes 6 weeks-2 months.
T3
4 times rapid
Latent Period 6-12 hours
Peak in 2-3 days
Composed of large numbers of closed follicles filled with colloid and lined with cuboidal epithelial cells that secrete into the interior of the follicles
The major component of colloid is the large glycoprotein Thyroglobulin contains the thyroid hormones within its molecule.
50mg/year, 1mg/week
Ingested iodine in the form of iodides
Iodides ingested orally are absorbed from GIT
⅕ removed from the blood by thyroid cells for synthesis of hormones; rest excreted through kidneys.
Basal membrane of thyroid cells has an active pump to push iodides to interior (Iodine Pump).
Normally 30% more conc. Inside
Max. active 250% more conc. Inside
The rate of Iodine trapping is influenced by conc. of TSH
TSH stimulates and hypophysectomy greatly diminishes the activity of the iodide pump in thyroid cells.
The Ultimate Guide to Understanding the Human Digestive SystemDeepanshuYadav2
Human Digestive System: Unraveling the Intricacies of our Inner Factory
Introduction
Welcome to this comprehensive guide on the human digestive system! In this article, we will embark on a fascinating journey through the intricacies of our inner factory, exploring the processes and functions that allow our bodies to break down and absorb nutrients from the food we consume. Join us as we unravel the secrets of digestion, absorption, and elimination, shedding light on the marvelous mechanism that keeps us nourished and energized.
The Human Digestive System: An Overview
The human digestive system is a complex network of organs and processes that work together to facilitate the digestion and absorption of food. From the moment we take a bite to the final elimination of waste, this remarkable system ensures that our bodies receive the vital nutrients needed for growth, repair, and maintenance.
The Mouth: Where It All Begins
The journey of digestion commences in the mouth. As food enters our oral cavity, it undergoes the first stage of mechanical digestion through the process of chewing. The teeth break down the food into smaller pieces, increasing its surface area for efficient chemical digestion. The saliva, secreted by the salivary glands, also plays a crucial role by moistening the food and initiating the breakdown of complex carbohydrates with the enzyme amylase.
The Esophagus: A Pathway to the Stomach
Once food is sufficiently chewed and mixed with saliva, it travels down the esophagus, a muscular tube connecting the mouth to the stomach. Through rhythmic contractions known as peristalsis, the esophagus propels the food downward, allowing it to reach the stomach for further processing.
The Stomach: A Gastric Playground
The stomach serves as a temporary reservoir for food and facilitates both mechanical and chemical digestion. It churns and mixes the food with gastric juices, including hydrochloric acid and enzymes such as pepsin. This powerful combination breaks down proteins and kills harmful bacteria, preparing the food for the next phase of digestion.
The Small Intestine: The Hub of Absorption
The small intestine is where the magic of absorption truly takes place. Divided into three parts—the duodenum, jejunum, and ileum—it receives the partially digested food from the stomach. The walls of the small intestine are lined with finger-like projections called villi, which increase the surface area for nutrient absorption. Here, the nutrients are broken down into their smallest forms and are transported into the bloodstream for distribution to the body's cells.
The Large Intestine: Processing Waste
As the now-depleted food mass enters the large intestine, the focus shifts from digestion to waste processing. The large intestine absorbs water and electrolytes from the remaining undigested material, forming solid waste known as feces. The feces are then stored in the rectum until elimination through the anus occurs.
1. absorption: passage of digested products from the intestinal lumen through mucosal cells and into the bloodstream or lacteals
2. chemical digestion: enzymatic breakdown of food
3. chyme: soupy liquid created when food is mixed with
digestive juices
4. defecation: elimination of undigested substances from the
body in the form of feces
5. ingestion: taking food into the GI tract through the mouth
6. mastication: chewing
7. mechanical digestion: chewing, mixing, and segmentation
that prepares food for chemical digestion
8. peristalsis: muscular contractions and relaxations that propel
food through the GI tract
9. propulsion: voluntary process of swallowing and the
involuntary process of peristalsis that moves food through the
digestive tract
10. segmentation: alternating contractions and relaxations of
non-adjacent segments of the intestine that move food
forward and backward, breaking it apart and mixing it with
digestive juices
this lecture gives detailed account of functions of liver as an organ, secretion, regulation and functions of biliary secretion. exocrine and endocrine functions of pancreas. composition of pancreatic secretions
Bile is a bitter-tasting, dark green to yellowish brown fluid, produced by the liver , it is stored in the gallbladder and upon eating is discharged into the duodenum. .
The principal function of the gallbladder is to serve as a storage reservoir for bile.
The main components of bile are water, bile salts, bile pigments, and cholesterol
Bile salts act as emulsifying agents in the digestion and absorption of fats. Cholesterol and bile pigments from the breakdown of hemoglobin are excreted from the body in the bile.
Physical properties;
Hepatic bile: pH 7.4, colour is golden yellow ,
Bladder bile: pH 6.8, color is green dark to yellow (darker)
Volume of bile produced reaches to one liter of bile per day (depending on body size).
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
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This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
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This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
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Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
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The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
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2. Pancreatic secretions:
• Pancreas; complex gland ( similar to salivary glands)
Except of having an Endocrine part(secreting insulin&
glucagons)
• Digestive part which consist of acini secreting digestive
enzymes :
• 1.Pancreatic lipase: for digesting fats.
2.Pancreatic Amylase: for
digesting carbohydrates.
3.Pancreatic
Trypsin,chymotrypsin,carboxypolypeptidase,elastase &
neuclease: for digesting proteins.
• All Secreted in an inactive form in the acini inside
pancrease :
• (trypsinogen,chymptrypsinogen,procarboxypolypeptidas
e) to prevent autodigestion of pancreas & this
inactivation is facilitated by a substance called trypsin
3. Pancreatic secretions:
• When this trypsin inhibitor is overwhelmed by
pancreatic duct obstruction or pancreatic diseases or
damag,e the proteolytic inactive enzymes are activated
inside pancreatic acini leading to acute pancreatitis
causing death or pancreatic insufficiency.
5. Activation of Pancreatic Enzymes:
• Inactive panc enzymes are only activated when they reach the SI .
• by an enzyme released from SI cells; enterokinase stimulated by
the presence of chyme.
• 1st
enzyme activated is trypsinogen to active trypsin & trypsin in
turn activates the other enzymes: CTP&PCP.
• Pancreatic ductioles & ducts secreting HCO3 important for
neutralizing the acid of the chyme coming to the upper SI from
stomach & for preparing the optimal alkaline medium essential
for digestion in SI.
6. Regulation of pancrearic secretion:
• I by vagi(ACH), Cholycystokinin(CCK) & Secretin.
• ACH, Cholycystokinin(CCK) :cause secretion of mainly digestive
enzymes
• While Secretin causes mainly secretion of large amounts of
HCO3.
• Secretin released from upper SI cells ( S cells) in the presence of
acidic chyme causes secretion of large amounts of HCO3 from
pancreatic ducts( for neutralization of acidic chyme coming from
stomach resulting in formation of Nacl & water)
• Secretion of pancreatic enzymes mainly under the control of CCK
which is secreted by SI cells (I-cells) in response to the presence of
food in upper SI specially protein&fat digestion end
products(peptones, proteoses & long chain fatty acids. )
• Vagal stimulations helps both processes but the effects of Secretin
& CCK are more pronounced.
7. Phases of pancreatic secretion:
The same for of gastric acid secretion:
1.cephalic phase. 2.gastric phase. 3.intestinal phase.
8.
9. Bile secretion:
•It helps :
• Fat digestion by saponification & emulsification of fats.
• Essential for excretion of several important waste products from
blood as billirubin & cholesterol.
•The amount is 1000ml./day.
•Composition of bile :about 50% are bile salts + billirubin,
cholesterol,lecithin & plasma electrolytes.
•In the gall bladder water & large amounts of electrolytes except
Ca++ are reabsorbed by gall bladder mucosa, but the other
constituents bile salts,cholesterol & lecithin are not reabsorbed so
become highly concentrated.
11. Figure 24.21a, b
Bile Salts and Emulsification
fat
globule
Water (polar)
bile
salts
fat droplets
bile salt
phospholipids
triglycerides
Increases surface
area for attack
by lipases.
polar coating
12. Emptying of gall bladder:
• Needs:
• Contraction of gall bladder wall & relaxation of
sphincter of oddi(SOO)
• CCK plays an important role in contraction of gall
bladder wall & to less degree relaxation of (SOO)
• Relaxation of (SOO) mainly in response to movement of
the wall of upper SI.
13.
14. Bile salts & their functions:
• 0.6gms. is secreted /day.
• Synthesized from cholesterol which is converted to cholic acid &
chenodeoxycholic acid & both combine with glycin or taurin to
form glyco or tauro conjugated bile acids.
• Functions:
• The main functions is :
• 1.Emulsificatin of fats to form micelles to facilitate Fat absorption
• 2.Secretion of some important waste products as billirubin &
cholesterol.
• The enterohepatic circulation of bile salts from the SI is through
the terminal ileum TI to the liver then to SI again ,so in TI disease
or removal, this enterohepatic circulation of bile salts is
interupted causing bile salts deficiency and so fat malabsorption.
• The hormone Secretin causes secretion of HCO3 & not bile acids
from the bile ductioles for neutralization of excess acid coming
from stomach in cooperation with the pancreatic HCO3.
• CCK causes secretion of bile& bile acids.
16. Gall stones formation:
• Is mainly due to imbalance between bile salts & cholesterol
content of bile ,either more cholesterol or less bile salts so excess
cholesterol will precipitate to form cholesterol gall stones.
• Causes of gall stones:
• 1.Too much absorption of water to form concentrated bile easy to
precipitate.
• 2.Too much absorption of bile acids.
• 3.Too much secretion of cholesterol into the bile mainly from diet.
• 4.Inflamation of gall bladder epithelium.
• Medical therapy of gall stones:
• Although the mainstay of gall stones therapy is surgery,sometimes
the patient is given bile salts in form of ursodeoxycholic acid or
chenodeoxycholic acid for at least 1 year, which help in
redissolution of cholesterol gall stones by increasing the ratio of
bile salts in relation of cholesterol.
17. Secretions of SI:
• Of 3 types:
• 1.Brunner glands for mucose secretion.
• 2.Crypts of Liberkhan for secretion of pure extracellular fluid to
aid absorption of intestinal contents by active secretion of HCO3
& Cl- into the crypts these cause osmotic movement of water.
• 3.SI enzymes present on villi brush border consisting of;
• A.Several different peptidases for splitting peptides into amino
acids.
• B.Several disaccharidases as sucrase,maltase,isomaltase and
lactase.
• C.Small amounts of intestinal lipase for splitting neutral fats into
glycerol & fatty acids.
• The regulation of SI secretions is by local enteric stimuli through
local enteric reflexes and hormonal secretions specially Secretin &
CCK.
18. Large intestinal secretions:
Are:
• 1.Mucose secreted by mucose cells in colonic wall .
• The mucose protects the colonic wall from excoriation & bacterial
activity and provides an adherent medium for holding feces
together.
• 2.HCO3 by crypts of Liberkhan ,stimulated by tactile stimuli &
pelvic PS nerves.
• The HCO3 protects the colonic wall from acids formed deep in
the feces by intestinal flora.
• No Enzymes in the colon & no digestion.
19. MCQs:
Pancrease:
A. Is the only gland that contain all the 3 major digestive enzymes.
B. The proteolytic enzymes are active inside the pancrease.
C. Is the same as salivary glands.
D. Its Enzyme secretions is under hormonal control only.
E. Is the main source of Lipase in GIT.
20. MCQs:
Lipase:
A. Is present only in the pancrease.
B. Small amounts is present in saliva.
C. Small amount is present in the stomach.
D. Is absent on the small intestinal brash boarders.
E. Bile is essential for its action.
21. MCQs:
Match the following:
A.Secreten. F. Contraction of gall bladder.
B. Enterokinase. G.Inhibits proteolytic enzymes.
C. Trypsin inhibitor. H. Activates proteolytic enzymes.
D. CCK. 1. Stimulates pancreatic bicarbonate.
E. Bile acids. J. Inhibt cholesterol precipitation.
22. MCQs:
CCK Actions include:
A. Pancreatic enzymes secretion.
B. Pancreatic enzymes activation.
C. Pancreatic bicarbonates secretion.
D. Bile secretion stimulation.
E. Gall bladder contraction.
23. MCQs:
Bile acids:
A. Help digestion of fat.
B. Consumed in fat digestion.
C. Is in continuous enterohepatic circulation.
D. Prevent gall stone formation.
E. Have many therapeutic uses .
24. MCQs:
Small intestinal villi brush boarders contain the following enzymes:
A. Peptidases.
B. Disacharidases.
C. Lipase.
D. Amylase.
E. Gelatiase.