Blood flow through the heart
1. Deoxygenated blood from the body enters the right side of the heart through the venina Cava
2. Valve between the right atrium and the right ventricle stops backflow
3. Heart muscles contract and blood goes through the pulmonary artery to the lungs to be oxygenated
4. Blood comes back to the heart through the pulmonary vein into the left atrium
5. Blood goes into the left ventricle then out to the body through the aorta