The cardiac muscle
A)extracts oxygen and nutrients from the blood within its chambers
B)receives its blood supply primarily during ventricular systole when blood is forced into coronary arteries
C)receives its blood supply directly from the pulmonary circulation as all of this blood passes through the coronary circulation
D)receives most of its blood supply during ventricular diastole by means of coronary arteries
E)does not receive blood in any of the ways mentioned above

Question

Quizplus · Accepted Answer

The cardiac muscle receives most of its blood supply during ventricular diastole by means of coronary arteries. During ventricular systole, the heart muscle contracts and squeezes the coronary arteries, limiting blood flow. However, during ventricular diastole, when the heart muscle relaxes, the coronary arteries are able to fill with blood and bring oxygen and nutrients to the cardiac muscle.

The Cardiac Muscle