PSL301H1 Lecture Notes - Lecture 8: Heart Valve, Mitral Valve, Tricuspid Valve
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PSL301H1 Full Course Notes
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Contraction-relaxation cycles: function is to generate pressure gradient orderly movement of blood. Blood flows from high low pressure. Absolute pressures are lower on the right side of the heart: although events are the same! Diastole: ventricles are relaxed: ca2+ not bound to myocytes muscle relaxed. The relationship b/w pressure, volume, and the heartbeat. Vibrations following closure of atrioventricular valves: isovolumic ventricular contraction. Vibrations following closure of semilunar valves: isovolumic ventricular relaxation. End diastolic volume end systolic volume = stroke vlume. End diastolic volume (edv) = volume of blood, when heart is full. End systolic volume (esv) = volume of blood, when heart is relaxed. A: starts from end systolic volume least amount of blood in heart. A"-b: force atrial blood into ventricles[isovolumic ventricular contraction] B: ends at end diastolic volume fullest amounts of blood in heart. Increased venous return: increases amount of blood heart is filled with, higher end diastolic volume higher diastolic pressure, higher pressure greater stroke volume.
