Positioned at the base of the ascending aorta is the aortic semilunar valve when it leaves the left ventricle. When the left ventricle contracts, the aortic semilunar valve opens, and it closes as a result of the arterial pressure of the blood when the left ventricle relaxes. Therefore, this valve prevents the backflow of blood into the relaxed left ventricle.
Distinct ridges also named trabeculae carneae are on the inner surface of both ventricucar walls, which reinforce the endocardium of the ventricles.
Blood vessels which convey blood from the right ventricle to the lungs for gas exchange, and then to the left atrium of the heart, are included by the pulmonary circulation. All the vessels of the body that are not part of the pulmonary circulation, are connected with the systemic circulation, which functions to convey blood to and from all of the cells and tissues of the body, except to that part of the lungs provided by the pulmonary vessels.
The flow of blood through the numerous vessels in the myocardium is named the coronary circulation. The wall of the heart has its own supply of blood vessels to meet its its vital needs. The left and right coronary arteries arising from the aorta are the main coronary vessels, which immediately beyond the aortic semilunar valve. Through the coronary sinus on the posterior surface of the heart, most of the deoxygenated blood leaves the heart wall.
- June 13, 2012 @ 02:25:45 [Current Revision] by Ji Guanghua
- April 3, 2011 @ 01:52:31 by Escritt
- April 3, 2011 @ 01:50:53 [Autosave] by Ji Guanghua
- March 30, 2011 @ 03:34:18 by Ji Guanghua
- March 30, 2011 @ 03:31:32 by Ji Guanghua
- March 30, 2011 @ 03:31:20 by Ji Guanghua
- March 30, 2011 @ 03:09:57 by Ji Guanghua