Which statement is correct for the cardiac muscle?

Question

Quizplus · Accepted Answer

The correct statement about the cardiac muscle is that it receives most of its blood supply during ventricular diastole by means of the coronary circulation. The coronary arteries supply oxygen and nutrients to the cardiac muscle when it is relaxed during diastole. Option A is incorrect because the cardiac muscle does not extract oxygen and nutrients from the blood within its chambers; rather, it receives its blood supply from the coronary circulation. Option B is incorrect because ventricular systole is when the heart is contracting and therefore, blood flow to the myocardium is reduced. Option C is incorrect because the lung circulation and systemic circulation do not intersect in the cardiac circulation.

Which Statement Is Correct for the Cardiac Muscle