HPHY 323 Lect 16
HPHY 323 Lect 16 HPHY 323 and 324
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This 2 page Class Notes was uploaded by Naman Jain on Sunday April 5, 2015. The Class Notes belongs to HPHY 323 and 324 at University of Oregon taught by Runyeon in Fall. Since its upload, it has received 64 views. For similar materials see Anatomy II in Human Development at University of Oregon.
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Date Created: 04/05/15
Path blood takes L atriumgt Bicuspid valvegt L ventriclegt Aortic semilunar valvegt Aortagt Arteriesgt Arteriolesgt Capillariesgt Venulesgt Veinsgt Vena cavagt R atriumgt Tricuspid valvegt R ventriclegt Pulmonary semilunar valvegt L and R Pulmonary arteriesgt Lung Best explanation of the function of heart valves Prevent backflow Cardiac cycle Late diastole Both sets of chambers are relaxed Ventricles fi passively Atrial systole Atrial contraction forces a small amount of additional bloodgt ventricles lsovolumic ventricular contraction 1st phase of ventricular contraction Pushes AV valves closed Not enough pressure to open semilunar valves Ventricular ejection As ventricular pressure rises and exceeds pressure in the arteries Semilunar valves open Blood is ejected lsovolumic ventricular relaxation As ventricles relax Pressure in ventricles fall Blood flows back into cusps of semilunar valves and snaps them closed Systole Contraction and emptying Diastole Relaxation and filling Pwave Atrial depolarization before contraction QRS complex Ventricular systole beginning atrial repolarization End diastolic volume end of diastole after QRS Twave Ventricular repolarization Bloodgt ventricles Passively through atria 80 Through atrial systole 20 Ventricular Systole 2 phases lsovolumic contraction AV valves closed Semilunar valves closed Ejection AV valves closed Semilunar valves open Stroke volume Amount of blood ejected from one ventricle in one cardiac cycle During a single systole End diastolic volume end systolic volume Expressed as ml of blood Ejection fraction SV EDV x 100 Cardiac output Volume of blood pumped from the ventricle in one minute Heart rate x stroke volume Liters of blood per minute
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