Pulmonary valve
McGraw-Hill Science & Technology Dictionary:
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pulmonary valve
(′pu̇l·mə′ner·ē ′valv)
(anatomy) A valve consisting of three semilunar cusps situated between the right ventricle and the pulmonary trunk.
Oxford Dictionary of Sports Science & Medicine:
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pulmonary valve
A semi-lunar valve that prevents backflow of blood from the pulmonary artery to the right ventricle.
American Heritage Stedman's Medical Dictionary:
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pulmonary valve
n.
A valve with semilunar cusps at the entrance to the pulmonary trunk from the right ventricle of the heart.
Wikipedia on Answers.com:
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Pulmonary valve
heart
Latin = /heart/ |
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| Anterior (frontal) view of the opened heart. White arrows indicate normal blood flow. | |
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| Heart seen from above. | |
| Gray's | subject #138 532 |
| MeSH | Pulmonary+Valve |
The pulmonary valve (sometimes referred to as the pulmonic valve) is the semilunar valve of the heart that lies between the right ventricle and the pulmonary artery and has three cusps. Similar to the aortic valve, the pulmonary valve opens in ventricular systole, when the pressure in the right ventricle rises above the pressure in the pulmonary artery. At the end of ventricular systole, when the pressure in the right ventricle falls rapidly, the pressure in the pulmonary artery will close the pulmonary valve.
The closure of the pulmonary valve contributes the P2 component of the second heart sound (S2). The right heart is a low-pressure system, so the P2 component of the second heart sound is usually softer than the A2 component of the second heart sound. However, it is physiologically normal in some young people to hear both components separated during inhalation.
Additional images
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Interior of right side of heart.
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Pulmonary valves
See also
External links
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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Oxford Dictionary of Sports Science & Medicine
The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved.
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American Heritage Stedman's Medical Dictionary
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.
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