BIOL 1010 Chapter Notes - Chapter 27: Heart Valve, Rheumatic Fever, Heart Murmur
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14 May 2017
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Heart rate and cardiac output depend on health and age. Act as one-way doors at the exits of the atria and ventricles during a cardiac cycle. Open when pushed from one side and closed when pushed from the other. The powerful contraction of the ventricles forces blood against the av valves, which closes them and keeps blood from flowing back into the atria. The semilunar valves are pushed open when the ventricles contract. When the ventricles relax, blood in the arteries starts to flow back toward the heart, causing the flaps of the semilunar valves to close and preventing blood from flowing back into the ventricles. Occurs when a stream of blood backward through a valve. Some are born with it other have their valves damaged by infections (an example would be rheumatic fever) If surgery is needed, replacement with a synthetic valve or from an organ donor (human or animal usually a pig) is used.
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