Prelim2A2006answers

Prelim2A2006answers - INTRODUCTORY ANIMAL PHYSIOLOGY BIOAP...

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INTRODUCTORY ANIMAL PHYSIOLOGY BIOAP 311/VETBM 346 Fall 2006 PRELIM II - VERSION I October 31, 2006 ANSWERS Mean = 34 +/- 5
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1. The slow depolarization of the cells of the SA node as it moves towards threshold is due to the slow leakage of Ca ++ into the cells. B = false Sodium, not calcium! 2. The AV node is innervated ONLY by the parasympathetic branch of the autonomic nervous system while the SA node is innervated only by the sympathetic branch. B = false Both systems innervate both nodes. The following EIGHT (8) questions refer to the figure below. A = true B = false 3. The volume of blood in the left ventricle is at its minimum when the peak of aortic pressure is reached during interval B . B see ventricular volume curve in Figure 9-5 4. The increase in atrial pressure seen during interval A is due to the small leakage of blood into it from the contracting ventricle. A see explanation of c wave on page 108
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5. Point H indicates the time in the cardiac cycle when the atrio-ventricular valves slam shut. B this is when the aortic valve slams shut. 6. The T-wave of the EKG starts during interval E . B it starts during interval B 7. An observed shift from dashed curve 1 to dashed curve 2 would be expected in the case of left ventricular failure. B note that the peak ventricular pressure is the same. 8. During interval E the volume of blood in the left ventricle remains constant . B this is when the atria add more blood to the ventricle. 9. The increased pressure indicated by dashed curve 3 during interval B is accompanied by an increased atrial volume . A blood flows into the atria even during ventricular contraction. 10. The first heart sound corresponds to the time in the cycle indicated by point G . A see figure 9-5
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The following five (5) questions refer to the figure below. A = true B = false 11. The highest point of curve segment A corresponds in time to when the end diastolic pressure would be measured. B this is peak systolic pressure! 12. The slope of line segment C is directly proportional to ventricular wall compliance. B it is inversely proportional. 13. The pressure/volume relationships defining area EW apply equally well to either ventricle. A the values on the Y axis would be different, but the shape of the area would be defined in the same way.
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14. A shift from curve G to curve H could indicate a leaky aortic valve. B
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Prelim2A2006answers - INTRODUCTORY ANIMAL PHYSIOLOGY BIOAP...

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