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BSC 2010 (Ellington) Practice Exam5
1. To maximize the rate of passive diffusion of oxygen into an organism one should
_________. (A) increase d and A, (B) increase A but decrease C, (C) increase d,
(D) decrease d, or (E) decrease A and D.
2. ____________ is (are) (an) example(s) of convection. (A) blood flow, (B)
movement of water across fish gills, (C) movement of air in and out of lungs, (D)
all of the above or (E) none of the above.
3. Which of the following P and R combinations would produce the highest blood
flow? (P, R ; units not important) (A) 50, 22, (B) 50, 58, (C) 50, 120, (D) 50, 1
or (E) 50, 1.8.
4. An animal with a closed circulatory system would _______. (A) generally have a
relatively high blood volume relative to body volume, (B) generally be small and
sluggish, (C) generally have very low blood pressure, (D) generally show a low
blood flow or (E) none of the above.
5. Mammals differ from fish in that ______. (A) there is no mixing of oxygenated
and deoxygenated blood in fish, (B) blood pressure in fish is higher than
mammals, (C) in fish there are separate gill and systemic pumps, (D) in mammals
there are separate lung and systemic pumps or (E) all of the above.
6. Blood pressure is highest __________. (A) during diastole, (B) during systole, (C)
in the veins, (D) in the capillaries or (E) in lymphatic vessels.
7. When the left ventricle contracts_____________. (A) the AV valve opens, (B) the
left atrium contracts, (C) the right ventricle relaxes, (D) the left atrium relaxes, or
(E) the semi-lunar valve in the aorta closes.
8. The right AV valve ________________. (A) prevents blood flow from right
ventricle into right atrium, (B) is open during atrial contraction, (C) is open during
ventricular diastole, (D) all of the above, or (E) none of the above.
9. Heart contraction in mammals _________. (A) is spontaneous, (B) is controlled
by nerves, (C) controlled by circulating hormones, (D) all of the above or (E)
none of the above.
10. The normal pathway of flow of blood is from ______. (A) right atrium to left
atrium, (B) left ventricle to left atrium, (C) right ventricle to left ventricle, (D) left
atrium to left ventricle or (E) aorta into left ventricle.
11. The major disadvantage(s) of oxygen uptake in water relative to air is
(are)_______. (A) respiratory water loss, (B) low oxygen content of water, (C)
high D, (D) low viscosity or (E) none of the above.
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12. Ventilation _______________________. (A) is the movement of the respiratory
medium across the gas exchange surface, (B) is not required for protozoans like
amoebae, (C) is obligatory for squid, (D) all of the above, or (E) none of the
above.
13. The site of gas exchange in the mammalian lung is ________. (A) air capillary,
(B) bronchus, (C) alveolus, (D) lamella, or (E) tracheole.
14. In the mammalian lung, air is expelled when______. (A) the diaphragm relaxes,
(B) the pressure inside of the lung decreases relative to the outside air pressure,
(C) the volume of the thoracic cavity increases, (D) all of the above, or (E) none
of the above.
15. Blood is not involved in gas exchange in insects because _______. (A) gas
exchange takes place across the skin, (B) insects are so small that they do not
need blood, (C) insects are so sluggish and inactive that they do not need blood,
(D) oxygen is delivered by small tubes DIRECTLY to the cells, or (E) none of the
above.
16. In terms of partial pressures of oxygen and carbon dioxide, the blood leaving
the heart by way of the aorta will be different from the blood entering the
lungs by way of the pulmonary artery in what respects?: (A) oxygen will be lower
and carbon dioxide will be lower, (B) oxygen will be the same and carbon dioxide
will be the same, (C) oxygen will be higher and carbon dioxide will be higher, (D)
oxygen will be higher and carbon dioxide will be lower or (E) there will be no
differences.
17. Hemocyanin _______ (A) is found in turtles, (B) binds oxygen at low PO2’s, (C)
releases oxygen at high PO2’s, (D) all of the above or (E) none of the above.
18. The concentration of dissolved CO2 (present as gas) in the blood of veins
________. (A) is higher than the concentration of HCO3-, (B) is lower than the
concentration of HCO3-, (C) is highest in the blood LEAVING the lungs, (D) is
the lowest in blood ENTERING the lungs, (E) none of the above.
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