Digestive System
• The digestive system
includes the mouth,
pharynx, esophagus,
stomach, small intestine,
and large intestine.
• It’s function is to
convert food into usable
substances for the body
cells
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Digestive System - Biology - Lecture Slides, Slides of Biology
Biology course consisting some basics and some advanced topics. This biology lecture is about: Digestive System, Mouth, Esophagus, Stomach, Rectum and Anus, Large Intestine, Enzymes
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2013/2014
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Digestive System
•^
The digestive systemincludes the mouth,pharynx, esophagus,stomach, small intestine,and large intestine.
-^
It’s function is toconvert food into usablesubstances for the bodycells
Mouth
-^
Teeth
are use for cutting,tearing,and
crushing food into small fragments.
-^
Saliva
helps you make it easier to chew
your food.
-^
Amylase
helps break the chemical bonds of
starches and releases sugar. breakdown ofcarbohydrates into smaller molecules. Thisprocess is called
chemical digestion
.
-^
Lysozyme
helps fight infection by digesting
the cell wall of many bacteria which mayenter in your mouth with food.
Stomach
•^
Food from the esophagus empties into a largemuscle called the
stomach.
•^
Chemical Digestion
the lining of the stomach
contains millions of microscopic gastric glands.
-^
The acid activates pepsin, an enzyme that beginsthe digestion of proteins.
-^
In digestion, the muscles of the stomach mix thegastric fluids and food. This mixture is called chyme
Small Intestine
-^
Small intestine
Most of all the chemical digestion and
absorption of food occurs in the small intestine.
-^
Pancreas
gland that serves two important functions for
digestion.
1.
Enzymes that break down carbohydrates, proteins,
and lipids.
2.
Pancreas also produce sodium bicarbonate, a base
that neutralizes stomach acid.
-^
Liver
makes a fluid called
Bile
that helps digest lipids.
-^
Gall Bladder-
Stores Bile
-^
Villi
–the surface of the small intestine is covered with
fingerlike projection which absorb digested food.
Rectum and Anus
-^
Rectum
stores waste material until the body
is ready to remove it.
-^