Download Digestion #4 - Iowa State University

GI System 4:
Session 4
Supplemental Instruction
Iowa State University
Leader:
Course:
Instructor:
Date:
Blake
AnS 214
Dr. Selsby
9-10-15
A. SI anatomy
1) The three parts of the small intestine, in order, are...
2) Name and define the 3 structural features of the SI that increase its surface area.
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3) True / False
The GI tract is outside the body.
4) Large fat globules are __________ by bile salts in the duodenum. Digestion of fat by the
pancreatic enzyme __________ yields free fatty acids and monoglycerides. These then associate
with bile salts to form _________ which “ferry” them to the intestinal mucosa. Fatty acids and
monoglycerides leave micelles and _________ into epithelial cells. There they are recombined
with proteins to form __________. These are extruded from the epithelial cells by
_____________. The chylomicrons enter ___________ and are carried away from the intestine
by lymph.
5) Describe the gastro-colic reflex.
Review of pancreatic enzymes
1.) ______________ is activated by enterokinase. Activation converts it to ______________. It
then activates Chymotrypsinogen and ___________________. Trypsin and _______________
are “biters” and _______________________ is considered a “chewer”. The other “chewer”
proteases are ____________________ and _______________________.
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True/ False self check. I encourage you to not use your notes on this portion to see if you know
the material.
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CCK is a hormone derived from the pancreas.
Secretin induces bicarbonate production.
Lipids cannot be broken down in the stomach.
Aminopeptidase is a chewer protease that attaches on the amino terminus of a peptide.
Fat cells coated with only bile salts are considered chylomicrons
Fats, once broken down will be eventually carried away by lymph.
The cardiac sphincter is between the stomach and the duodenum.
Some mechanical breakdown happens in the stomach.
Paracrine secretions are designed to diffuse to far away targets.
H20 and C02 form to make carbonic anhydrase
Pepsin can activate pepsinogen.
The enterogastric reflex is when the duodenum wants more food from the stomach.