Physiology 2130 Lecture Notes - Lecture 8: Aortic Valve, Mitral Valve, Heart Valve
21 Jul 2017
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The heart: beats roughly 2. 5 billion times, ~160,000km of blood vessels, valves in heart ensure one-way flow of blood through the heart. Right atrioventricular (av) valve tricuspid valve: pumps blood to nearby lungs (does not contract. Left atrioventricular (av) valve bicuspid/mitral valve: pumps blood to rest of body (requires strong contraction) 80%: cells joined together by structures called intercalated discs. Sa node action potential: na+ permeability is higher in sa nodal cells thus allowing depolarization, ca2+ similar to na+ and also move into the cell, recall: k+ wants to move outside the cell along its concentration gradient. Conducting system of the heart: ap generated at sa node cannot directly go to ventricle muscles. P wave depolarization of the atrial muscle leading to their contraction. Qrs wave depolarization of the ventricle muscle leading to their contraction. T wave repolarization of the ventricular muscle as it relaxes.
