HBY 531 MEDICAL PHYSIOLOGY

LECTURE EXAM 3

2004

Section 1: Answer the following using:

a = increase

b = remain unchanged

c = decrease

1. During the cephalic phase of acid secretion, the Na⁺ concentration in the stomach will __________. (C)

2. During the gastric phase of acid secretion, the C1^- concentration in the stomach will __________. (A)

3. The diameter of the Sphincter of Oddi will __________ in response to secretin. (B)

4. Chief cell secretion of pepsinogen will _________ as secretin levels increase in the blood. (A)

5. Segmentation and peristalsis within the small intestine will ________ in the presence of VIP. (C)

6. For a normal healthy adult, the transport maximum (T_m) for phosphate reabsorption in the kidney will ___________ following a change from a low to a high phosphate diet. (C)

7. Compared to normal, the rate of bone resorption will _______ following a sustained increase in plasma cortisol. (A)

8. Compared to normal, the rate of bone resorption will _________________ following an increase in plasma PTHrp during hypercalemia of malignancy. (A)

9. Compared to normal, the rate of bone resorption will _____________ following the development of hypoparathyroidism. (C)

10. The number of GnRH receptors on gonadotropes will _________ following continuous infusion of GnRH. (C)

11. Plasma testosterone will __________ following continuous infusion of GnRH. (C)

12. Plasma androstenedione levels will _____________ after blocking 17 b-hydroxysteroid dehydrogenase activity. (A)

13. Nitric oxide release during the erection phase of the male sexual response will _________ upon injury to the lumbar splanchnic nerves. (B)

14. Gonadotropin levels will_______ following ovulation. (C)

15. With the onset of a primary ovarian failure, levels of gonadotropins will _______. (A)

16. Placental secretion of human chorionic gonadotropin (hCG) will _______ after the 12^th gestational week. (C)

Section 2: For each of the following, choose the single best response.

17. Acid secretion by parietal cells will increase as a result of: (D)

a. blockade of gastrin receptors.

b. increasing prostaglandin levels.

c. cutting the vagus nerve.

d. distension of the stomach

18. Chloride ion flux from crypt cells: (D)

a. is inward if the resting potential is less negative than the chloride equilibrium potential.

b. is inward if the resting potential is more negative than the chloride equilibrium potential.

c. increases as a result of PKA dependent phosphorylation.

d. both a and c.

19. Damage to the 9^th cranial nerve (glossopharyngeal): (D)

a. will not affect the oral phase of swallowing.

b. will affect the pharyngeal phase of swallowing.

c. will not affect the esophageal phase of swallowing.

d. all of the above are correct.