Monday
Feb152010

Heart Valves

The valves of the heart ensure that blood flows in only one direction. There are four valves in the human heart, including the tricuspid valve, the pulmonic valve, the mitral valve, and the aortic valve, which ensure that blood flows from the body, to the lungs, and back to the body again. Please see the steps to blood flow outlined below.

 

Direction of Blood Flow, generally:

1. De-oxygenated blood flows from the body to the right side of the heart 2. The right ventricle pumps blood to the lungs 3. Oxygenated blood returns to the left atria, and the left ventricle pumps this blood to the rest of the body

 

Direction of Blood Flow across the Heart Valves:

1. Deoxygenated blood flows into the right atrium, 2. Crosses the tricuspid valve, 3. Fills the right ventricle, 4. Crosses the pulmonic valve, 5. Is oxygenated in the lungs, 6. And is returned to the left atrium Now that the oxygenated blood has been returned to the left atrium... 1. Oxygenated blood collects in the left atrium 2. Passes through the mitral valve 3. Fills the left ventricle 4. Is pumped out of the left ventricle 5. Crosses the aortic valve 6. And is pumped to the rest of the body for energy!

 

Human Heart Diagram

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