When the atria of the heart are full of blood, the ____ valves are closed.
A) atrioventricular
B) aortic
C) pulmonary
D) pulmonary and aortic
E) atrioventricular and aortic

Question

​When the atria of the heart are full of blood, the ____ valves are closed.
A) atrioventricular​
B) ​aortic
C) ​pulmonary
D) ​pulmonary and aortic
E) ​atrioventricular and aortic

Quizplus · Accepted Answer

When the atria of the heart are full of blood, the ventricles are in the process of filling, which means the atrioventricular valves (tricuspid and mitral valves) are open to allow blood to flow from the atria to the ventricles. The pulmonary and aortic valves, which are semilunar valves, are closed during this phase to prevent backflow of blood into the ventricles from the pulmonary artery and aorta, respectively. This occurs during the ventricular diastole phase of the cardiac cycle.

​When the Atria of the Heart Are Full of Blood

When the Atria of the Heart Are Full of Blood