During rest and during running, when do the coronary arteries primarily fill?

During rest and during running, when do the coronary arteries primarily fill?

• A. Diastole is longer than systole in both rest and running
• B. Systole is longer than diastole in resting but diastole longer when running
• C. Diastole is shorter than systole in both
• D. Diastole equals systole during running

Answer: (A)