M_718128_2010-01-07 - Question 1: (2 points) A major...

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Question 1: (2 points) A major difference between skeletal and cardiac muscle is: a. neurogenic contraction in cardiac myocytes b . contractile cells with tapered ends c. greater number of mitochondria in skeletal myocytes d . different amounts of lipids used in aerobic respiration Question 2: (2 points) Which of the following is NOT a great vessel attached directly to the heart? a. ascending aorta b . descending aorta c. superior vena cava d . left pulmonary vein Question 3: (2 points) The right atrioventricular valve is also known as the: a. bicuspid valve b . the mitral valve c. the aortic valve d . the tricuspid valve Question 4: (2 points) Heart valves allow blood to flow in both directions a. True b . False Question 5: (2 points) Blood from the superior vena cava enters the: a. left ventricle b . right ventricle c. right atrium d . left atrium Question 6: (2 points)
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Which groups of autorhythmic cells branch out through the ventricular myocardium? a. the sinoatrial nodes b . the bundle of His c. Purkinje fibers d . the atrioventricular nodes Question 7: (2 points) The ______ serves as the cardiac pacemaker. a. AV node b . SA node c. Diaphragm d . AV bundle Question 8: (2 points) Which of the following contributes directly to the plateau phase of the cardiac action potential? a. increased membrane permeability to sodium b . decreased membrane permeability to potassium c. increased membrane permeability to potassium d . decreased membrane permeability to calcium Question 9: (2 points) Which of the following statements regarding the behavior of cardiac muscle cells at rest is FALSE? a. The permeability of the membrane to sodium is high relative to skeletal muscle cells b . The permeability of the membrane to potassium is greatest c. The cardiac cell is especially dependent on the Na,K-ATPase due to the high resting permeability to Na+. d . Chloride permeability is significantly greater than potassium permeability. Question 10: (2 points) During what phase of the cardiac muscle action potential is there a rapid efflux of K+?
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a. the plateau phase b . the falling phase c. the rising phase d . none Question 11: (2 points) Tetanus in the heart is not possible because: a. there are no distinct motor units in the heart b . there is inadequate O2 supply to support a sustained contraction
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This note was uploaded on 05/06/2010 for the course CHE 1103 taught by Professor Ermler during the Fall '08 term at The University of Texas at San Antonio- San Antonio.

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M_718128_2010-01-07 - Question 1: (2 points) A major...

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