GI System
Session 3
Supplemental Instruction
Iowa State University / Leader: / Ivy
Course: / AnS 214
Instructor: / Selsby
Date: / 1/23/11

REGULATION OF GASTRIC FUNCTION:

*Name the 3 phases of gastric function and their corresponding activating factors:

1.

2.

3.

*Fill in the blanks in the diagram below with the controls of gastric motility:

LIVER AND GALLBLADDER:

*Name the major functions of the liver:

* Bile, while produced by the _________is stored in the ______. It has a(n)________ pH, and consists of cholesterol derived ________, the pigment _________, as well as cholesterol, neutral fats, phospholipids and electrolytes.

*How does the gallbladder concentrate bile?

*From which ducts is bile released from the gallbladder?

PANCREAS:

*What are the major functions of the pancreas and what does it secrete?

*Fill in the diagram with the zymogens produced in the pancreas on the left, and the activated product on the right. Write the activating enzyme for each above the arrow:

______------> ______

______------>______

______------> ______

HORMONAL CONTROL OF INTESTINAL SECRETIONS:

*Name the three main hormones of the enteroendocrine system and define their functions:

1.______:

Activated by:

2.______:

Activated by:

3.______:

Activated by

*On the diagram at the right, fill in the steps involved with hormonal control of secretions

1. Acid and fats from the stomach stimulate the secretion of ______and ______from the ____________.

2. Both hormones enter the bloodstream.

3. CCK induces the pancreas to secrete ______________, while secretin causes it to secrete ___________.

4. _________and _________, traveling through the bloodstream, induce the increased production of ______in the liver.

5. ______causes the gallbladder to contract and expel its contents into the _____________.

6. During the ______and _________ phases, vagal nerve stimulation causes the gallbladder to contract.

SMALL INTESTINE:

*What are the three parts of the small intestine (in order):

*Name and define the 3 structural features of the small intestine that increase its surface area: