Valves - Bi Sci 001 Wednesday April 7 1999 Announcements...

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Bi Sci 001 Wednesday April 7, 1999 Announcements: Test this friday Lecture notes: Valves Valves prevent backflow into the heart. The general term for the valves between the atria and the ventricles is atrioventricular valves. The specific term for the valve between the right atrium and right ventricle is the tricuspid valve. The valve between the left atrium and the left ventricle is the mitral valve. The general term for valves leading to blood vessels is semilunar valves. The specific term for the valve between the right ventricle and the pulmonary artery is the pulmonary valve. The valve leading from the left ventricle to the aorta is the aortic valve. The heart gets its oxygen and nutrients not from the blood flowign through it, but from the coronary arteries which are the first two arteries that come off the aorta. Blood Vessels Direction of heart flow: Heart --> arteries --> arterioles --> capillaries --> venules --> veins --> heart …continued. Arteries: carry blood away from the heart. They have a thick muscle layer and 2 elastic layers to resist the high pressure of the blood as it is ejected from the ventricles and to move the blood along as they rebound.
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