The Phase in the Cardiac Cycle When the Mitral Valve

Question

The phase in the cardiac cycle when the mitral valve is closed and the aortic valve is open is the
A) atrial systole.
B) early diastolic filling phase.
C) late diastolic filling phase.
D) systolic ejection phase.
E) dicrotic phase.

Accepted Answer

During the systolic ejection phase, the aortic valve is open and blood is being ejected from the left ventricle into the aorta. The mitral valve is closed during this phase to prevent blood from flowing back into the left atrium.