stomach & si 2016.notebook
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Stomach & SI 2016.notebook
1
May 11, 2016
May 62:26 PM
Joe's Stomach
May 62:26 PM
Stomach flexible bag that holds food & breaks it down to liquid form
GASTRIC JUICES
HCl released by the parietal cells; aids in activation of pepsinogen to pepsin, kills any harmful substances
Mucous protection from itself
Pepsinogen an inactive enzyme, which digests proteins. It is released by the chief cells and it is converted to pepsin upon mixing with HCl.
peristalsis of the stomach grinds, squeezes & churns food
This mixes with the secretions of the stomach to form CHYME
Stomach & SI 2016.notebook
2
May 11, 2016
May 67:55 PM
Chyme leaves the stomach through the pyloric sphincter. It enters the 1st part of the small intestine (duodenum) and is mixed with
1. enzymes from the pancreas, ex. lipase, trypsin, lactase
2. bile from the gall bladder (made in the liver) to emulsify fat
3. bicarbonate to neutralize stomach acid
mechanical
chemical
May 62:26 PM
The small intestine is divided into 3 sections;
duodenum
jejunum
ileum
Food is moved by peristaltic contractions.
The surface area of absorption must be
large, therefore, the intestines are long
and have projections on the wall. These projections
are called villi and they are also covered with tiny, bumps called microvilli.
Stomach & SI 2016.notebook
3
May 11, 2016
May 88:35 AM
AbsorptionNutrients move from the digestive tract into the blood stream as chyme passes through the _______________. The surface area is immensely large due to:
• length of SI
• villi
• microvilli
Stomach & SI 2016.notebook
4
May 11, 2016
May 62:26 PM
Homework
The Digestive System Handout
Joe's Intestine
Absorption of Materials Handout.
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