An increase in afterload will cause the heart to remain longer in the period of isovolumetric contraction.

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Afterload is the resistance that the heart has to overcome to eject blood from the ventricles. An increase in afterload can occur due to narrowing of blood vessels, increased blood pressure, or other factors. This increased resistance means that the heart has to generate more pressure to overcome it, leading to a longer period of isovolumetric contraction (when the ventricles are contracting but no blood is leaving the chamber). This allows the heart to build up enough pressure to overcome the increased afterload and open the valves to eject the blood. Therefore, an increase in afterload will cause the heart to remain longer in the period of isovolumetric contraction.

An Increase in Afterload Will Cause the Heart to Remain