Semilunar valve

Semilunar valves are valves in the heart that allow blood to flow from the heart into the arteries but prevent blood from flowing back into the heart. There are two semilunar valves in the heart: the aortic valve and the pulmonary valve.

Structure

Semilunar valves are composed of three pocket-like cusps. Each cusp is a thin, crescent-shaped piece of tissue. The cusps of the semilunar valves are strong and flexible, allowing them to open and close with each heartbeat.

Function

The primary function of the semilunar valves is to prevent the backflow of blood into the heart. When the heart contracts, or beats, the semilunar valves open to allow blood to flow out of the heart and into the arteries. When the heart relaxes, the semilunar valves close to prevent blood from flowing back into the heart.

Clinical significance

Problems with the semilunar valves can lead to heart conditions such as aortic stenosis, aortic regurgitation, pulmonary stenosis, and pulmonary regurgitation. These conditions can cause symptoms such as shortness of breath, chest pain, and fatigue, and may require treatment with medication, surgery, or other interventions.

See also

• Heart valve
• Cardiac cycle
• Cardiovascular system

References

Semilunar valve Resources
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