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Cards In This Set
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Stroke Volume
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Volume of blood ejected from a ventricle per contraction.
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Cardiac Output
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Volume of blood ejected from a ventricle per minute.
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Cardiac output (ml/min) = ___________ x heartrate
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Stroke volume (ml)
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Preload
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Amount the heart stretches before contraction
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An (increase/decrease) in preload results in an (increase/decrease) in force of contraction and stroke volume.
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Increase;increase
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Contractility
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Forcefulness of contraction of the heart muscle tissues.
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An (increase/decrease) in contractiliy results in an (increase/decrease) in stroke volume.
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Increase;increase
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(Increases/Decreases) in contractility are stimulatd by (Sympathetic/Parasympathetic activity) and digitals, while (increases/decreases) occur through inhibition of (Sympathetic/Parasympathetic activity), anesthetics, and (increased/decreased) extracellular K+.
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Increases; Sympathetic activity; decreases; Sympathetic activity; increased
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Afterload
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Amount of force the contraction must provide to open the semilunar valves.
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An (increase/decrease) in afterload results in a (increase/decrease) in stroke volume.
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Increase; decrease
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Afterload is often (increased/decreased) by hypertension and (atherosclerosis/arteriosclerosis).
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Increased; atherosclerosis
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