PHGY 210 midterm - 2003

PHGY 210 midterm - 2003 - Physiology 210 Mid-term March...

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Physiology 210 Mid-term March 2003 TYPE A 1. When does ventricular filling occur? a. During atrial contracion b. Before atrial contraction c. During early ventricular contraction d. After atrial contraction prior to ventricular contraction e. During ventricular ejection phase Answer : b 2. The arterial baroreceptor reflex is primarily responsible for : a. Maintaining circulating blood volume constant b. Adjusting venous return to maintain ventricular ejection c. Maintaining mean arterial blood pressure constant d. Adjusting fluid losses by way of kidneys e. Slow adjustments in arterial pressure Answer : c 3. Following an AP, the membrane potential of the heart pacemaker cells a. Gradually depolarizes b. Gradually hyperpolarizes c. Stays constant d. Cannot be easily influenced e. Cannot be measured Answer : a 4. The pulmonary and systemic circulations are arranged a. In series b. In parallel c. Longitudinally d. In tandem e. None Answer : a 5. The main role of the cardiovascular system is 1
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a. Generating body heat b. Rapid movement of oxygen and metabolic substrates from the external environment to the internal body environment c. Production of blood cells d. Control of blood flow velocity e. Maintenance of muscle tone Answer: b 6. Hysteresis in a physiological variable is the signature of a. A subcritical Hopf bifurcation b. A supercritical Hopf bifurcation c. A transcritical Hopf bifurcation d. A saddle-mode Hopf bifurcation e. A pitchfork Hopf bifurcation Answer: a 7. In a person at rest, the arterial PO2 is equal to 100 mmHg. However, during a treadmill test, the PaO2 value drops to 90 mmHg. The drop in PaO2 could be due to a. b. c. A decrease rate of O2 diffusion d. e. Answer: c 8. The rate of diffusion of PO2 across the alveolar capillary membrane a. Increases during hypoventilation b. Increases in patients with pulmonary emphysema c. Increases in patients with lung fibrosis d. Decreases during mild exercise e. Depends on the difference between PO2 in the alveolar gas and in the mixed venous blood Answer: e 9. Alveolar ventilation does not change when a. There is a small concentration of CO2 in the inspired air b. There is a small concentration of CO in the inspired air c. There is a 3 fold increase in respiratory frequency and a 3 fold decrease in the tidal volume 2
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d. The body metabolism decreases e. The vagal rapidly adaptationg receptors are stimulated Answer: b 10. In a healthy individual visiting a location at a high altitude, the PO2 in the arterial blood
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This note was uploaded on 04/19/2008 for the course PHGY 210 taught by Professor Trippenbach during the Spring '08 term at McGill.

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PHGY 210 midterm - 2003 - Physiology 210 Mid-term March...

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