210MIDTERM

210MIDTERM - 1. What component of the cardiac conduction...

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1. What component of the cardiac conduction system distributes electrical signals through the papillary muscles directly? a) The atrio -ventricular node. b) The atrio -ventricular bundle. c) The sino-atrial node. d) The bundle of His. e) The Purkinje system. 2. The velocity of blood flow is the lowest in a) the systemic arteries. b) the pulmonary artery. c) the pulmonary veins. d) the vena cava. e) the capillaries. 3. The main pacemaker cells of the heart are located in a) the atrio -ventricular node. b) the Hensen’s node.
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c) the bundle of His. d) the Purkinje system. e) the sino-atrial node. 4. The PR interval of the electrocardiogram corresponds to the time taken for electrical activation to travel through a) the atria and the atrioventricular node. b) the Purkinje fibers. c) the bundle of His and the bundle branches. d) the sino-atrial node. e) all the above structures. (For the above question, both (a) and (e) were accepted as correct responses) 5. Which of the following is TRUE about the stroke volume response to mild and moderate submaximal dynamic exercise? a) Stroke volume increases primarily due to an increase in end-diastolic volume.
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b) Stroke volume increases due to an increase in heart rate. c) Stroke volume increases due to an increase in total peripheral resistance. d) Stroke volume increases due to an increase in systolic pressure. e) Stroke volume increases due to an increase in end-systolic volume. 6. In a patient with advanced pulmonary fibrosis, a) the rate of oxygen diffusion through the alveolar-capillary membrane remains normal. b) the recoil pressure of the lungs is increased. c) the airway resistance is increased. d) the functional residual capacity (FRC) is larger than in a healthy individual. e) the alveolar ventilation-perfusion ratio is increased. 7. Under normal circumstances, alveolar ventilation a) increases when the body metabolic rate increases . b) increases when PO 2 in the arterial blood is above 80 mmHg. c) increases during CO poisoning. d) decreases after both vagus nerves are cut. e) is equal to the minute ventilation.
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8. In a climber at high altitude, where air PO 2 is about 60 mmHg, a) minute ventilation increases. b)
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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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210MIDTERM - 1. What component of the cardiac conduction...

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