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8 Cards in this Set
- Front
- Back
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The portion of the intrinsic conduction system located in the interventricular septum is the:
A) AV node B) SA node C) AV bundle D) Purkinje fibers |
A) AV node
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An ECG provides information about:
A) cardiac output B) movement of the excitation wave across the heart C) coronary circulation D) valve impairment |
C) coronary circulation
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The sequence of contraction of the heart chambers is:
A) random B) left chambers followed by right chambers C) both atria followed by both ventricles D) right atrium, right ventricle, left atrium, left ventricle. |
B) left chambers followed by right chambers
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The fact that the left ventricular wall is thicker than the right reveals that it:
A) pumps a greater volume of blood B) pumps blood against greater resistance C) expands the thoracic cage D) pumps blood through a smaller valve |
C) expands the thoracic cage
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The chordae tendineae:
A) close the atrioventricular valves B) prevent the AV valve flaps from everting C) contract the papillary muscles D) open the semilunar valves |
B) prevent the AV valve flaps from everting
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In the heart, which of the following apply? (1) Action potentials are conducted from cell to cell across the myocardium via gap junctions, (2) the SA node sets the pace for the heart as a whole, (3) spontaneous depolarization of cardiac cells can occur in the absence of nerve stimulation, (4) cardiac muscle can continue to contract for long periods in the absence of oxygen.
A) all of the above B) 1, 3, 4 C) 1, 2, 3 D) 2, 3 |
B) 1, 3, 4
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The activity of the heart depends on intrinsic properties of cardiac muscle and on neural factors. Thus,
A) vagus nerve stimulation of the heart reduces heart rate B) sympathetic nerve stimulation of the heart decreases time available for ventricular filling C) sympathetic stimulation of the heart increases its force of contraction D) all of the above |
C) sympathetic stimulation of the heart increases its force of contraction
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Freshly oxygenated blood is first received by the:
A) right atrium B) left atrium C) right ventricle D) left ventricle |
B) left atrium
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