The heart

The heart

The circulatory system is made up of heart, blood vessels and blood.

The heart is a pumping organ that keeps the organ flowing around the body. The heart has valves to make sure that the blood flows in the right directions.

This is how the heart uses the four chambers: right atrium, right ventricle, left atrium and left ventricle.

• Blood flows intoo the two atria from the vena cavaand the pulmonary vein
• The atria contract, pushing the blood into the ventricles
• The ventricles contract, forcing the…