The heart contracts to pump blood around the body The heart consists of a
right side and a left side.
Both sides have an atria and a ventricle Blood flows into the atria and then
enters the ventricle.
When the heart contracts the blood flows out of the atria and enters the
ventricles and the second contraction allows blood to go from the ventricles
to the destination. The blood from the right ventricle goes to the lungs to get
oxygenated and the blood from the left ventricle goes to the rest of the body.