cardiac hypertrophy

Why Does Heart Rate Increase During Exercise Quizlet?

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Why Does Heart Rate Increase During Exercise Quizlet? During exercise, your body may need three or four times your normal cardiac output, because your muscles need more oxygen when you exert yourself. During exercise, your heart typically beats faster so that more blood gets out to your body. Why does heart rate increase during exercise?

How Does Contractility Affect End Diastolic Volume?

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How Does Contractility Affect End Diastolic Volume? Increased heart rate alone decreases stroke volume because of reduced time for diastolic filling, which decreases end-diastolic volume. How does contractility affect EDV? Briefly, an increase in venous return to the heart increases the filled volume (EDV) of the ventricle, which stretches the muscle fibers thereby increasing their