THE MOVEMENT OF BLOOD THROUGH THE HEART

1. Deoxygenated blood arrives via the superior and inferior vena cava. 
2. The blood moves into the right atrium and passes through the tricuspid valve.
3. The blood then moves into the right ventricle which then passes through the pulmonary valve.
4. Blood then arrives in the pulmonary artery which carries the deoxygenated blood to the lungs.
5. The lungs cause gaseous exchange to occur which removes the carbon dioxide from the blood and refuels it with oxygen. 
6. The newly oxygen rich blood then returns to the heart via the pulmonary vein.
7. The blood passes into the right atrium and through the mitral valve.
8. Blood arrives in the right ventricle and then passes through the aortic valve.
9. Once through the aortic valve, the oxygen rich blood arrives in the aorta which delivers the blood to the organs and tissues through arteries. 
10. Once the oxygen rich blood has been sapped by the organs and tissues, the process will start over again and the veins will carry the deoxygenated blood back to the heart.

BLUE = DEOXYGENATED BLOOD

RED = OXYGENATED BLOOD

ITALICS = SYSTEMIC CIRCULATION

NORMAL = PULMONARY CIRCULATION