Question

Blood is ejected from the left ventricle once pressure within ________.

A) the ventricle is greater than pressure within the aorta
B) the ventricle is less than pressure within the aorta
C) the ventricle is greater than pressure within the pulmonary artery
D) the ventricle is less than pressure within the pulmonary artery
E) the muscles of the pulmonary semilunar valve relax

Answer 1

Blood is ejected from the left ventricle once pressure within the ventricle is greater than pressure within the aorta and the pulmonary trunk.

Step-by-step explanation:

In the second phase of ventricular systole, the ventricular ejection phase, the contraction of the ventricular muscle has raised the pressure within the ventricle to the point that it is greater than the pressures in the pulmonary trunk and the aorta. Blood is pumped from the heart, pushing open the pulmonary and aortic semilunar valves.