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Untitled Prezi

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Edith Lucia Lopez

on 21 January 2015

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Transcript of Untitled Prezi

Digestive System
connects the pharyx to the stomach
*3 layers of smooth muscle
Small intestine
Large intestine
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
Food passes down to the esophagus
Valve that protects the trachea from food.
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
Bolus passes through the
cardiac sphincter
into the stomach
*pH 2 -very very acidic
-> proteins
-> lipids
¨**gastric amylase->
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
pancreatic amylase
pancreatic lipase
pancreatic trypsin
--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
*protective mucous layer
Gastrin--neuropeptide that sends signals to the brain
Bacteria break down materials not absorbed. Sometimes produce methane.
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