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Digestive System: Control of the Digestive System

1. List the three phases of digestive system processes:

1. _____________________

2. _____________________

3. _____________________

2. The ___________ nerve triggers the responses during the cephalic phase of digestion.

3. List the four main responses during the intestinal phase of digestion:

1. _____________________

2. _____________________

3. _____________________

4. _____________________

4. The small intestine typically________.

a. slows gastric emptying

b. accelerates gastric emptying

c. has no effect on gastric emptying

5. The ____________ and _________ ____________ nerves carry parasympathetic impulses to the enteric nervous system.

6. Sympathetic NS innervation of the digestive tract is via ____________ fibers.

a. preganglionic

b. postganglionic

7. All preganglionic ANS fibers release _______, while only postganglionic fibers of the sympathetic division release _________.

8. Which of the following neurotransmitters stimulates smooth muscle contraction in the digestive tract?

a. VIP

b. norepinephrine

c. NO

d. ACh

9. ______ slow intestinal motility and cause the pyloric sphincter to contract.

10. List five peptide hormones of the GI tract:

1. _____________________

2. _____________________

3. _____________________

4. _____________________

5. _____________________

11. List four functions of duodenal CCK.

1. _____________________

2. _____________________

3. _____________________

4. _____________________

12. Secretin stimulates gastric HCl secretion.

a. True

b. False

13. GIP stimulates the pancreas to secrete_________.

14. ______ stimulates motility of the intestine, thereby moving its contents toward the terminal ileum.

15. _______ occurs when the combined action of two hormones is greater than the sum of their individual effects.