Video Transcript
The cardiac cycle has two distinct
phases, systole and diastole. Complete the following
statement. The diastole phase occurs when the
ventricles blank and the atrioventricular valves open.
As we know, the heart is
responsible for pumping blood to the various organs of the body. The pumping action of the heart
involves cycles of contractions and relaxations of the chambers of the heart. These chambers are the left and
right atria and the left and right ventricles. The atrioventricular valves control
the passage of the blood between each atrium and ventricle.
The period of complete relaxation
of the ventricles is called diastole. This is when the blood contained in
the atrium fills the ventricles after the opening of the atrioventricular
valves. Then, the period of contraction of
the ventricles is called the systole. This is when the blood is pumped
out of the heart through the pulmonary artery and aorta.
Now, we can answer our
question. The diastole phase occurs when the
ventricles relax and the atrioventricular valves open.
