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a) Preload is the degree to which the ventricles are filled with blood and the myocardial fibers are ...

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a) Preload is the degree to which the ventricles are filled with blood and the myocardial fibers are stretched just prior to contraction. (b) Afterload is the systolic pressure in the aorta that must be overcome for blood to be ejected from the left ventricle.
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