Semilunar valve

Semilunar Valve

The Semilunar Valve (pronunciation: /ˈsɛmɪˌluːnər ˈvælv/) is a type of heart valve that has a half-moon shape, hence the name 'semilunar'.

Etymology

The term 'semilunar' is derived from Latin, where 'semi-' means 'half' and 'luna' means 'moon'. The term 'valve' comes from the Latin 'valva', which means 'a part of a door'.

Function

The semilunar valves are located in the heart, specifically in the aorta and the pulmonary artery. They function to prevent the backflow of blood into the heart after it has been pumped out.

Types

There are two types of semilunar valves:

1. Aortic Semilunar Valve: This valve is located between the left ventricle and the aorta. It opens to allow blood to leave the heart, and closes to prevent blood from flowing back into the heart.
2. Pulmonary Semilunar Valve: This valve is located between the right ventricle and the pulmonary artery. It functions in the same way as the aortic semilunar valve, but with respect to the pulmonary artery.

Related Terms

• Heart Valve
• Aorta
• Pulmonary Artery
• Left Ventricle
• Right Ventricle
• Aortic Valve
• Pulmonary Valve

External links

• Medical encyclopedia article on Semilunar valve
• Wikipedia's article - Semilunar valve

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