Isovolumetric Contraction occurs when the AV valves are closed.

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Prepare for the Ivy Tech Anatomy and Physiology II (APHY 102) Heart Test with multiple-choice questions, detailed explanations, and study resources. Enhance your understanding and excel in your exam!

Multiple Choice

Isovolumetric Contraction occurs when the AV valves are closed.

Explanation:
Isovolumetric contraction is the early part of ventricular systole when the ventricles start to contract but the blood volume in them doesn’t change. This happens because the AV valves have just closed to prevent blood from flowing back into the atria, so the ventricles seal off from the atria. At the same time, the semilunar valves are still closed because the ventricular pressure hasn’t yet surpassed the arterial pressure to push blood into the arteries. With both sets of valves closed, the ventricular volume remains constant while pressure rises. That’s why the AV valves being closed is the defining feature of this phase.

Isovolumetric contraction is the early part of ventricular systole when the ventricles start to contract but the blood volume in them doesn’t change. This happens because the AV valves have just closed to prevent blood from flowing back into the atria, so the ventricles seal off from the atria. At the same time, the semilunar valves are still closed because the ventricular pressure hasn’t yet surpassed the arterial pressure to push blood into the arteries. With both sets of valves closed, the ventricular volume remains constant while pressure rises. That’s why the AV valves being closed is the defining feature of this phase.

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