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8 Cards in this Set
- Front
- Back
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ventricular systole |
AV valves close and pressure within the ventricles begin to rise Cardiac muscle fibers depolarize |
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ventricular diastole |
ventricular muscle repolarize, leading to drop in pressure and filling of the ventricle |
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afterload |
aortic blood pressure pressure required to open a semilunar valve |
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preload |
end-diastolic volume. the amount of blood remaining after contraction of the ventricles (filling up of ventricles) |
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Stroke Volume (SV) |
blood pumped out from one heartbeat |
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contractility |
strength of cardiac muscle contraction. Passive contractility - changing the length of cardiac muscle fibers (Frank-Starling mech) |
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active contractility |
stimulation of the sympathetic nerves to the heart (NE or epinephrine)
action potential invades the t-tubules and Ca2+ is released from the sarcoplasmic reticulum
as a result, the number of actin/myosin crossbridge interactions is increased |
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Frank-Starling mechanism |
relation between the rise in stroke volume and rise in preload |
