Sample Lecture Exam #4

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P215 – Basic Mammalian Physiology
Summer 2003
Lecture Exam #4 NAME
I recommend that you mark answers on the exam form first, then fill out the answer sheet when you have
completed the exam. Fill out your answer sheets carefully and avoid erasing answers. You will have the
entire class period to complete this exam. Good luck!
A. “Either/Or” Questions (2 points each, 28 points total). Select the correct term of the two provided to
make the statement true, and mark the corresponding letter (a or b) on your answer sheet.
1. As fluid moves down the descending limb of the loop of Henle, its osmotic concentration (a. increases
/ b. decreases).
2. Ovulation is triggered by a surge of (a. FSH / b. LH) near the end of the follicular phase of the ovarian
cycle.
3. The peripheral chemoreceptors are more sensitive to (a. O
2
/ b. CO
2
) level in the blood.
4. Testosterone is produced by the (a. Leydig / b. Sertoli) cells of the testes
5. The (a. afferent arteriole / b. efferent arteriole) leads blood out of the glomerulus to the peritubular
capillaries.
6. As PO
2
increases, the percentage of oxyhemoglobin saturation in the blood (a. increases / b.
decreases).
7. Pancreatic juice tends to be (a. alkaline / b. acidic) in pH.
8. Newly absorbed carbohydrates are transported out of the small intestine by the (a. cardiovascular / b.
lymphatic) system.
9. An ova (a. has / b. has not) completed its second meiotic division at the time it is released into the
female reproductive tract.
10. Blood pH tends to (a. increase / b. decrease) with elevated blood P
CO2
.
11. (a. ADH / b. Aldosterone) increases the permeability of the collecting duct walls to water, thus
increasing water reabsorption.
12. A fertilized egg is typically in the (a. zygote / b. blastocyst) stage when implantation occurs.
13. 2,3 DPG tends to promote oxygen (a. loading onto/ b. unloading from) hemoglobin
14. Prostaglandins are produced by the (a. seminal vesicles / b. prostate gland) in the male reproductive
system.

B. Multiple choice questions. Choose the best answer (3 points each, 72 points total).
15. Which of the following conditions would promote O
2
loading by hemoglobin?
a) decreased P
O2
c) both
b) increased pH d) neither
16. Which of the following segments of the nephron is involved in the process of filtration?
a) glomerulus c) distal convoluted tubules
b) proximal convoluted tubules d) collecting duct
17. Which of the following is an expiratory muscle?
a) diaphragm c) both are expiratory muscles
b) external intercostals d) neither are expiratory muscles
18. The protective layer of mucus that covers the gastric mucosa is produced by…
a) goblet cells c) parietal cells
b) chief cells d) little elves that live in a tree
19. The osmotic gradients needed to produce hyperosmotic urine are generated by the …
a) distal tubule c) collecting duct
b) glomerulus d) loop of Henle
20. The of digestive tract organs contains blood and lymph vessels that carry newly
absorbed nutrients into circulation.
a) mucosa c) muscularis
b) submucosa d) serosa
21. Alkalosis is a state where the pH of the blood is…
a) above 7.0 c) below 7.0
b) above 7.45 d) below 7.35
22. is a hypothalamal hormone that regulates the release of gonadotropins from the anterior
pituitary gland.
a) estrogen c) GnRH
b) LH d) oxytocin
23. The of a mature spermatozoan contains enzymes needed to penetrate the zona
pellucida of an egg cell.
a) head c) midpiece
b) acrosome d) tail

24. Most of the absorption of nutrients occurs in the …
a) stomach c) large intestine
b) pancreas d) small intestine
25. Progesterone is secreted at high levels during the of the ovarian cycle
a) menustrual phase c) follicular phase
b) proliferative phase d) luteal phase.
26. The is a structure located on the posterior surface of each testes that stores mature
spermatozoa.
a) epididymis c) vas deferens
b) seminal vesicle d) prostate gland
27. The thecal cells of an ovarian follicle produce .
a) estrogen c) human chorionic gonadotropin
b) progesterone d) testosterone
28. The central chemoreceptors of the medulla oblongata ultimately respond to changes in
concentration in the blood plasma.
a) O
2
c) H
+
b) CO
2
d) HCO
3
-
29. Glucose is reabsorbed out of the lumen of the kidney tubules through…
a) osmosis c) cotransport
b) primary active transport d) simple diffusion
30. The increase in estrogen that induces the onset of labor is ultimately caused by the production of
androgens by the…
a) placenta c) mother’s adrenal glands
b) mother’s ovaries d) fetus’ adrenal glands
31. Erythrocytes are able to convert H
2
O and CO
2
into H
2
CO
3
at much higher rates than would normal
due to the presence of the enzyme within them.
a) carbonic anhydrase c) enterokinase
b) ptyalin d) alkaline phosphatase
32. , which are amphipathic molecules derived from cholesterol that are produced by the
liver, are used to emulsify fat in the small intestine, thus aiding in fat digestion
a) chylomicrons c) micelles
b) lacteals d) bile salts

33. During inspiration, intrapulmonary pressure is atmospheric pressure.
a) less than c) equal to
b) greater than d) the opposite of
34. The is an organ that allows exchange of materials between fetal and maternal blood
during pregnancy.
a) placenta c) corpus luteum
b) amniotic sac d) chorion
35. Which of the following is the primary female sex organ, producing both gametes and steroid
hormones?
a) clitoris c) uterus
b) ovary d) vagina
36. According to , the pressure exerted by a given amount of a gas is inversely
proportional to its volume.
a) Bohr’s Law c) Boyle’s Law
b) Beer’s Law d) Buttafuco’s Law
37. Roughly of all the CO
2
transported in the blood is transported in the form of dissolved
CO
2
gas in the blood plasma
a) 1% c) 20-23%
b) 70% d) 7-10%
38. Secretion and reabsorption occur between the filtrate in the kidney tubules and the blood in the…
a) glomerulus c) efferent arterioles
b) afferent arterioles d) peritubular capillaries
WOO-HOO! You’re done!
Make sure your answer sheet is filled out completely!
Thanks for such a fun summer!

P215 Basic Human Physiology
Summer 2003
Lecture Exam #4 Answers
Question
Answer Question Answer
1 A 20 B
2 B 21 B
3 B 22 C
4 A 23 B
5 B 24 D
6 A 25 D
7 A 26 A
8 A 27 D
9 B 28 B
10 B 29 C
11 A 30 D
12 B 31 A
13 B 32 D
14 A 33 A
15 B 34 A
16 A 35 B
17 D 36 C
18 A 37 D
19 D 38 D