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Untitled Prezi

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by

Edith Lucia Lopez

on 21 January 2015

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Transcript of Untitled Prezi

Digestive System
Start
connects the pharyx to the stomach
Stomach
*3 layers of smooth muscle
Small intestine
Large intestine
Colon
Digestion
There are 2 kinds of digestion:

Mechanical- chewing and breaking it into smaller pieces.


Chemical-Breakdown of larger foods into smaller ones through enzymes.
amylase-> starch
chewing
Food passes down to the esophagus
Valve that protects the trachea from food.
Throat
Food enters the mouth and is chewed up.

Salivary Amylase starts breakdown of starch into glucose molecules
lined with smooth muscle
Bolus is formed
Bolus is transported to the stomach through
PERISTALSIS
Bolus passes through the
cardiac sphincter
into the stomach
*pH 2 -very very acidic
¨**Pepsin
-> proteins
¨**Lipase
-> lipids
¨**gastric amylase->
starch
Enzymes
It passes to the small intestine through the pyloric sphincter
Food is moved by Peristalsis
7m long
2.5 cm in diameter
Digestion depends on 3 accessory organs:
pancreas, liver and gallbladder
pancreas-
pancreatic amylase
pancreatic lipase
pancreatic trypsin
Liver-Secretes
bile
--break down fats
Gallbladder-stores excess bile
Food is absorbed through villi
Chyme moves to the large intestine
1.5 m
6.5cm diameter
Water is absorbed and it becomes feces
The final sphincter
Appendix
*protective mucous layer
Gastrin--neuropeptide that sends signals to the brain
Bacteria break down materials not absorbed. Sometimes produce methane.
Full transcript