When the blood returns from the rest of the body, the right atrium gets the blood without oxygen from the veins. When it enters the atrium, it passes through the Superior Vena Cava that connects to the right ventrical. Then it is sent to another valve known as the inferior vena cava, and goes through the Plumonary artery,which leads to the lungs.The left atrium gets the blood , containing oxygen, then sends it into the bicuspid valve,and into the left ventrical.As it leaves the left ventrical,it goes to the aorta,which contains the arteries that go to the body.The valves in each ventrical control the flow of blood out of the heart.If the blood begins to start a reverse flowing motion,then the valves are closed by the pressure of the blood .
THROUGH THE LUNGS
Once the blood has left the the left ventrical,the aorta branches out into smaller and smaller arteries that carry the blood to the legs,arms,head,and so on.Eventually,in the body tissues,these arteries become microscopic capullaries,in which,oxygen and waste products pass through easily.
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