The phase of systole that results in the greatest consumption of myocardial oxygen is isovolumetric contraction.

Question

Quizplus · Accepted Answer

During isovolumetric contraction, the heart muscle contracts without any change in volume, which results in a high pressure developing in the heart chambers. This increased pressure requires more energy from the heart muscle, leading to increased consumption of myocardial oxygen. Therefore, isovolumetric contraction is considered the phase of systole that results in the greatest consumption of myocardial oxygen.

The Phase of Systole That Results in the Greatest Consumption