Long Duration Twitch in Cardiac Muscle Rapid inflow Diastasis Aortic vale 120 Aonic valve closes opens A-V valve A-V valv closes 20 0 50100 150 200 Time (msec)
Length-Force Relationship in Cardiac Muscle: The Starling -Frank Curve. Total Active Passive Length
How Does Linear Force in a Muscle Produce Pressure in a Ventricle Two Equivalent Curves: Isolated Muscle Heart Length Volume (pressure is directly proportional to the force produced by the cells)
"lsovolumetric contraction"=Isometric Force Generation. Aortic Valve Mitral Valve Both valves closed;Muscle is activated and generates force isometrically. The pressure rises.No blood is ejected yet.Therefore it is called"isovolumetric". The energy required to generate this pressure does "pressure work" Note:This represents the Left Ventricle
Ejection. Ventricular pressure exceeds aortic pressure:The Aortic valve opens;Muscle now shortens.Blood is ejected into the aorta. Work is now being done.This is referred toas“volume work