The video explains the cardiac cycle, focusing on systole and diastole. During systole, the muscular wall of the ventricle contracts, pushing blood out of the heart into the body. In diastole, the heart muscle relaxes, allowing blood to flow from the atria to refill the ventricles.

What happens when the muscular wall of the ventricle contracts?

• Blood is pushed into the atria

• Blood is pushed out of the heart into the body

• Blood is pushed into the lungs

• Blood is pushed into the veins

What is the phase called when the ventricle contracts and blood is pushed out of the heart?

• Ventricular relaxation

• Systole

• Atrial contraction

• Diastole

During which phase does the heart wall muscle relax?

• Diastole

• Systole

• Ventricular contraction

• Atrial contraction

What occurs during diastole?

• The ventricles contract

• The atria contract

• The heart wall muscle relaxes

• The blood is pushed out of the heart

What allows the ventricles to refill with blood?

• Contraction of the atria

• Contraction of the ventricles

• Relaxation of the atria

• Relaxation of the heart wall muscle