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Understanding Heart Valves

The heart contains 4 valves. The valves open and close to keep blood moving in the right direction through the heart. As the heart beats, blood moves through it. With each squeeze, the valves open and close to keep blood moving forward. In this way, valves keep blood moving as efficiently as possible through the heart.

Close-up of open heart valve with arrow showing blood flow.

Close-up of closed heart valve.

 

When the heart relaxes between beats:

  • Oxygen-rich blood from the lungs fills the left atrium.

  • Oxygen-poor blood from the body fills the right atrium.

When the atria beat:

  • The left atrium squeezes, pushing blood through the mitral valve into the left ventricle.

  • The right atrium squeezes, pushing blood through the tricuspid valve into the right ventricle.

When the ventricles beat:

  • The left ventricle squeezes, pushing blood through the aortic valve out to the body.

  • The right ventricle squeezes, pushing blood through the pulmonic valve to the lungs.

Diagram of three cross-sectioned hearts showing blood flow during heartbeats.

 

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