Fall '09 - Question 1 Your answer is CORRECT. Which divides...

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Question 1 Your answer is CORRECT. Which divides the heart into left and right halves? a) arteries b) veins c) septum d) atria e) ventricles Question 2 Your answer is CORRECT. Which of the following factors would produce the greatest change in blood flow? a) doubling the radius of the vessel. b) doubling the difference in the pressure gradient within the vessel. c) doubling the viscosity of the blood. d) doubling the length of the vessel. e) halving the viscosity of the blood. Question 3 Your answer is CORRECT. Resistance: a) is a measure of the hindrance to blood flow through a vessel caused by friction between the moving fluid and stationary vascular walls. b) is doubled when the radius of the vessel is reduced by one-half. c) increases sixteen-fold when the radius of the vessel is reduced by one-half. d) both [a] and [b] above. e) both [a] and [c] above. Question 4 Your answer is CORRECT. Place these structures in the order that blood returning to the heart from the body would pass through them. 1. right ventricle 2. left atrium 3. right atrium 4. pulmonary artery 5. left ventricle 6. pulmonary vein a) 4, 2, 5, 6, 3, 1 b) 2, 5, 6, 4, 3, 1 c) 3, 1, 4, 6, 2, 5 d) 1, 3, 6, 4, 5, 2 e) 3, 2, 4, 6, 1, 5 Question 5 Your answer is INCORRECT. In the heart, valves are found a) between the atria and the ventricles. b) between the ventricles and the arteries.
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c) between the great veins and the atria. d) Both [a] and [b] e) All of these answers Question 6 Your answer is CORRECT. The flattening of the action potentials of myocardial contractile cells, called the plateau phase, is due to a combination of __________ K + permeability and __________ Ca 2+ permeability. a) increasing, increasing b) decreasing, decreasing c) increasing, decreasing d) decreasing, increasing Question 7 Your answer is CORRECT. Why can't tetany of the heart occur? a) There are no distinct motor units in the heart. b) There is inadequate oxygen supply via the coronary circulation to metabolically support a sustained contraction. c) The refractory period in cardiac muscle lasts almost as long as the duration of the resultant contraction. d) The heart contracts with maximal force every beat so it is impossible to increase the strength of cardiac contraction. e) Vagal stimulation slows down the heart rate to prevent summation of contractions. Question 8 Your answer is CORRECT. Which of the following is not true regarding the heart: a) To prevent their eversion during ventricular contraction, the aortic and pulmonary valves are connected to the ventricular walls by the chordae tendineae and papillary muscle. b) The heart requires its own circulatory circuit to obtain oxygen and nutrients from the blood because it can not obtain them from the blood being pumped in the chambers c) The left ventricular wall possesses more muscle (and is thicker) than the right ventricular wall. d)
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Fall '09 - Question 1 Your answer is CORRECT. Which divides...

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