The document summarizes the key functions and components of the human gastrointestinal (GI) system. It describes the roles and processes of the digestive organs like the mouth, esophagus, stomach, intestines, liver, and pancreas. It explains how food is mechanically and chemically broken down through movements like peristalsis and secretions including enzymes and bile. Nutrients are then absorbed into the bloodstream while waste is eliminated. The GI system works with accessory organs and glands to digest food for energy and building materials for the body's needs.
human digestive system and its function. Human digestive system starts from Mouth, buccal cavity, pharynx, esophagus, stomach, small intestine, large intestine, rectum and anus are the parts in the human digestive system.
human digestive system and its function. Human digestive system starts from Mouth, buccal cavity, pharynx, esophagus, stomach, small intestine, large intestine, rectum and anus are the parts in the human digestive system.
The Interaction of the internal and external organs that are responsible for the digestion process.
Grade 8 Power Point Presentation
Prepared by: Edsyl Berongoy Penas, LPT
it shows some of the information that you are looking with. this will help to guide about this topic. This only for educational purposes especially to those teachers that are teaching in public and private schools. and, also to those students, you are free to download and use this as your visual aid.. thank you.. Miggy :)
Austin Digestive System is an open access, peer reviewed, scholarly journal dedicated to publish articles covering all areas of Digestive System.
The journal aims to promote latest information and provide a forum for doctors, researchers, physicians, and healthcare professionals to find most recent advances in the areas of Digestive System. Austin Digestive System accepts research articles, reviews, mini reviews, case reports and rapid communication covering all aspects of Digestive System.
Austin Digestive System strongly supports the scientific up gradation and fortification in related scientific research community by enhancing access to peer reviewed scientific literary works. Austin Publishing Group also brings universally peer reviewed journals under one roof thereby promoting knowledge sharing.
The Interaction of the internal and external organs that are responsible for the digestion process.
Grade 8 Power Point Presentation
Prepared by: Edsyl Berongoy Penas, LPT
it shows some of the information that you are looking with. this will help to guide about this topic. This only for educational purposes especially to those teachers that are teaching in public and private schools. and, also to those students, you are free to download and use this as your visual aid.. thank you.. Miggy :)
Austin Digestive System is an open access, peer reviewed, scholarly journal dedicated to publish articles covering all areas of Digestive System.
The journal aims to promote latest information and provide a forum for doctors, researchers, physicians, and healthcare professionals to find most recent advances in the areas of Digestive System. Austin Digestive System accepts research articles, reviews, mini reviews, case reports and rapid communication covering all aspects of Digestive System.
Austin Digestive System strongly supports the scientific up gradation and fortification in related scientific research community by enhancing access to peer reviewed scientific literary works. Austin Publishing Group also brings universally peer reviewed journals under one roof thereby promoting knowledge sharing.
This presentation was delivered over two days to second year pharmacy students enrolled in a course in pharmacology & toxicology. This lecture is designed to accompany Goodman & Gilman's (12e) chapter 11.
753 Learning OutcomesAfter reading this chapter, .docxpoulterbarbara
75
3
Learning Outcomes
After reading this chapter, you will be able to:
3.1 Describe the processes and organs involved in
digestion.
3.2 Explain how food is propelled through the gas-
trointestinal tract.
3.3 Identify the role of enzymes and other secre-
tions in chemical digestion.
3.4 Describe how digested nutrients are absorbed.
3.5 Explain how hormones and the nervous sys-
tem regulate digestion.
3.6 Explain how absorbed nutrients are trans-
ported throughout the body.
3.7 Discuss the most common digestive disorders.
True or False?
1. Saliva can alter the taste of food. T/F
2. Without mucus, the stomach would digest itself. T/F
3. The major function of bile is to emulsify fats. T/F
4. Acid reflux is caused by gas in the stom-ach. T/F
5. The primary function of the large intes-tine is to absorb water. T/F
6. Feces contain a high amount of bacteria. T/F
7. The lymphatic system transports all nutrients through the body once they’ve been absorbed. T/F
8. Hormones play an important role in digestion. T/F
9. Diarrhea is always caused by bacterial infection. T/F
10. Irritable bowel syndrome is caused by an allergy to gluten. T/F
See page 110 for the answers.
Digestion,
Absorption,
and Transport
M03_BLAK8260_04_SE_C03.indd 75 12/1/17 11:28 PM
76 Chapter 3 | Digestion, Absorption, and Transport
The digestion of food begins even before you take that first bite. Just the sight and smell of homemade apple pie stimulates the release of saliva in
the mouth. The secretion of saliva and other digestive juices starts a cascade of
events that prepares the body for digestion, the chemical and mechanical
processes by which the body breaks food down into individual nutrient
molecules ready for absorption. Food components that aren’t absorbed are
excreted as waste (feces) by elimination. Although these are complex
processes, they go largely unnoticed. You consciously chew and swallow the
pie, but you don’t feel the release of chemicals or the muscular contractions
that cause it to be digested or the absorption of nutrient molecules through
the intestinal lining cells. In fact, you may be unaware of the entire process
until about 48 hours after eating, when the body is ready to eliminate waste.
In this chapter, we explore the processes of digestion, absorption, and
elimination, the organs involved, and the other biological mechanisms that
regulate our bodies’ processing of food and nutrients. We also discuss the causes
and treatments of some common gastrointestinal conditions and disorders.
What Are the Processes and Organs
Involved in Digestion?
LO 3.1 Describe the processes and organs involved in digestion.
Digestion, absorption, and elimination occur in the gastrointestinal (GI) tract, a mus-
cular tube approximately 20–24 feet long in an adult. Stretched vertically, the tube would
be about as high as a two-story building. It provides a barrier between the food within the
lumen (the hollow .
Human have a special digestive system than the other animals. We have to know how our body digest our food after having a meal. So, let's check it out.
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
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
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.
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2. Retrieved from Images from Purves et al., Life: The Science of
Biology, 4th Edition, by Sinauer Associates and WH Freeman .
The human digestive system
3. Functions of Digestive System.
The mechanical and chemical
breakdown of food .
Absorption of digested nutrients.
Supplying essential nutrients to
fuel the other organs and body
system.
4. Movement: propels food through the digestive system
Secretion: release of digestive juices in response to a
specific stimulus
Digestion: breakdown of food into molecular
components small enough to cross the plasma
membrane
Absorption: passage of the molecules into the body's
interior and their passage throughout the body
Elimination: removal of undigested food and wastes
Stages in the Digestive Process
5. The Gastrointestinal Tract Organs
The Mouth
The Pharynx and
Esophagus
The Stomach and
Small Intestine
The
Colon, Rectum, and
Anus
Pancreas
Liver
Gallbladder
The GI tract or alimentary canal
The accessory glands and
organs
6. Ingestion of food.
Propulsion of food and wastes
from the mouth to the anus
Secretion of mucus, water and
enzymes
Mechanical digestion of food
particles
Chemical digestion of food
particles.
Absorption of digested food.
Elimination of waste products by
defecation.
The Liver, gall bladder and
exocrine pancreas all secrete
enzymes for the digestion of
chyme.
The GI tract or alimentary
canal
The accessory glands and organs
The Gl Tract Organs functions
7. The mouth
The mouth is the beginning of the digestive
system.
Chewing and salivation soften, make it easy to
swallow.
An enzyme in saliva, ptyaline, converts
starches to sugars.
The tongue rolls the masticated food into a
ball, known as bolus and pushes it to the
posterior end of the mouth into the pharynx.
8. Retrieved from Image from Purves et al., Life: The Science of Biology, 4th
Edition, by Sinauer Associates and WH Freeman .
Structure of the throat and the mechanics of swallowing.
9. The Pharynx and Esophagus
The esophagus is a muscular tube connecting
the pharynx to the stomach that is part of
the upper gastrointestinal tract.
Mucus moistens food and lubricates the
esophagus. Bicarbonate ions in saliva
neutralize the acids in foods.
Swallowing moves food from the mouth
through the pharynx into the esophagus and
peristaltic waves propel food to the stomach.
10. The Stomach
a hollow organ, or "container, "holding food, it
serves as the mixer and grinder of food.
Secretes acid and powerful enzymes that
continue the process of breaking the food
down and changing it to a consistency of liquid
or paste.
11. Small Intestine
Made up of three segments -- the
duodenum, jejunum, and ileum
the 'work horse' of digestion, as this is where
most nutrients are absorbed. Peristalsis
moving food through and mixing it up with the
digestive secretions from the pancreas and
liver, including bile.
Carbohydrates, lipids and proteins are broken
down and digested.
12. Large Intestine
made up of the ascending (right) colon, the
transverse (across) colon, the descending
(left) colon and the sigmoid colon.
is responsible for processing waste so that
defecation (excretion of waste) is easy and
convenient.
absorb water and mineral salts from the
digested food
13. Rectum, and Anus
the rectum is to receive waste material or
feces from where the sigmoid colon is
stored, until it is excreted out of the body via
the anus.
Stool is stored in the sigmoid (S-shaped) colon
until a "mass movement" empties it into the
rectum, usually once or twice a day.
14. Accessory Digestive Organs
Liver :chemical "factory” the raw materials
absorbed by the intestine. second largest
organ. Weighs around 3 pounds.
make and secrete bile.
detoxifies potentially harmful chemicals. It
breaks down and secretes many drugs.
Gallbladder a storage sac for excess bile, and
then releases it into the duodenum to help
absorb and digest fats.
15. Retrieved from Images from Purves et al., Life: The Science of
Biology, 4th Edition, by Sinauer Associates and WH Freeman
The liver and associated organs
16. Accessory Digestive Organs
Pancreas : the chief factory for digestive
enzymes that are secreted into the duodenum.
These enzymes break down protein, fats, and
carbohydrates.
more than 1000 ml of digestive enzymes daily.
production of several hormones, such as
glucagon and insulin.
17. Retrieved from Images from Purves et al., Life: The Science of
Biology, 4th Edition, by Sinauer Associates and WH Freeman
The liver and associated organs
18. Regulation of Appetite
The hypothalamus in the brain has two centers
controlling hunger.
the appetite center.
the satiety center.
19. Regulation of Appetite
The presence of protein in the stomach stimulates secretion
of gastrin , which causes increased stomach acid secretion
and mobility of the digestive tract to move food.
Food passing into the duodenum causes the production of
secretin, which promotes release of alkaline secretions from
the pancreas, stops further passage of food into the intestine
until the acid is neutralized.
Cholecystokinin (CCK) is released from intestinal epithelium
in response to fats, and causes the release of bile from the
gall bladder and lipase (a fat digesting enzyme) from the
pancreas.
21. References
McCance, K.L., Heather, S.E., Brasher, V.L., & Rote, N.S.
(Eds.). (2006). Structure and Function of Digestive
System. Pathophysiology: The Biologic Basis for Diseases in
Adults and Children (5th ed.). St. Louis, MO: Elsevier Mosby.
Margaret Eckman, Debra Share(Eds.) (2013).Gastrointestinal
System. Pathophysiology made Incredibly Easy (5thed.)
Wolters Kluwer, Lippincott Williams & Wilkins
22. References
Digestive system. Retrieved from http://www.webmd.com
Digestive system .Retrieved from
http://www.buzzle.com/articles/digestive-system-fuction
Digestive system. Retrieved from
http://www.cchs.net/health/healthinfo/docs/1600/1699.asp?in
dex=7041function.html
Digestive system. Retrieved from
http://www.estrellamountain.edu/facutly/farebee/biobk/BioBoo
k DIGEST.html
Editor's Notes
Digestive process has different stages for digestion of food.
The system has two major components, the GI tract or alimentary canal, the accessory glands and organs.
Three main enzymes are involved in regulation of appetite; gastrin, secretin and cholecystokinin.