A&P Test 2

a-p-test-2

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Question 1 of 1

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504127

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When the heart beats, the __________ contract first.

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504128

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The left atrium collects blood from the __________ and empties into the left ventricle.

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504129

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Deoxygenated blood leaves the right ventricle through a semilunar valve and enters the __________.

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504130

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Compared to the right ventricle, the left ventricle __________.

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504131

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Marginal branches are extensions of the __________.

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504132

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In contrast to skeletal muscle, cardiac muscle cells have a __________ phase as part of their action potential.

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504138

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The refractory period of cardiac muscles is __________ than that of skeletal muscles.

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504140

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If undisturbed, the cells of the AV node will depolarize about __________ times per second.

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504142

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Without external interactions, the cells of the SA node depolarize __________ times per minute.

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504144

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The T wave represents __________.

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504146

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The contractile cells of the myocardium reach threshold because of an influx of __________.

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504149

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The dicrotic notch marks the point when the __________.

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504150

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The first heart sound, "lubb," marks the point when __________.

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504152

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The bundle branches __________.

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504156

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here is (are) __________ heart sound(s).

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