Test 3_2010 - PRINTABLE VERSION Test 3 You scored 60 out of...

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PRINTABLE VERSION Test 3 You scored 60 out of 100 Question 1 Your answer is CORRECT. Are chambers which receive blood returning to the heart: a) arteries b) veins c) septum d) atria e) ventricles Question 2 Your answer is CORRECT. Blood flow is affected by: a) pressure differences. b) the viscosity of the blood. c) the amount of friction in the blood vessels. d) the length and diameter of the blood vessels. e) all of these answers. Question 3 Your answer is INCORRECT. Resistance increases when: a) radius increases b) length decreases c) viscosity increases d) hematocrit decreases e) none of these answers Question 4 Your answer is CORRECT. Blood returning from the systemic circulation: a) enters the right atrium. b) enters the left atrium
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c) is poorly oxygenated. d) both [a] and [c] above e) both [b] and [c] above Question 5 Your answer is INCORRECT. Semilunar valves: a) prevent backflow of blood from the ventricles to the atria. b) prevent backflow of blood from the atria to the ventricles. c) prevent backflow of blood from the ventricles to the arterial trunks. d) prevent backflow of blood from the arterial trunks to the ventricles. e) none of these answers. Question 6 Your answer is CORRECT. The plateau of the myocardial contractile cells action potential results from the opening of voltage-gated slow _____ channels in the plasma membrane of the cardiac cell. a) sodium b) potassium c) calcium d) chloride e) magnesium 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.
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Question 8 Your answer is INCORRECT. Which of the following is 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 right ventricular wall possesses more muscle (and is thicker) than the left ventriclular wall. d) There are valves lying between the atria and the veins. e) All of these answers Question 9 Your answer is INCORRECT. The function of the atrioventricular node is to a) excite the left and right atrium. b)
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This note was uploaded on 01/05/2012 for the course CHEM 3321 taught by Professor Bean during the Spring '11 term at American Jewish University.

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Test 3_2010 - PRINTABLE VERSION Test 3 You scored 60 out of...

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