When does blood flow occur through the coronary circulation
A)mainly during systole
B)mainly during diastole
C)almost equally during systole and diastole
D)only during ventricular isovolumetric contraction

Question

Quizplus · Accepted Answer

Blood flow through the coronary circulation mainly occurs during diastole when the heart muscle is relaxed and the coronary arteries can fill with blood. During systole, the heart muscle contracts to pump blood out of the heart, which can briefly decrease blood flow through the coronary arteries. However, some blood flow can still occur during systole due to the elasticity of the arteries. Therefore, option B is the best choice as it accurately states that blood flow mainly occurs during diastole.

When Does Blood Flow Occur Through the Coronary Circulation