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Cardio
Lecture 4
17
Physiology
Undergraduate 2
02/27/2011

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Term
increased Ca
Definition
increases contractility (F of contraction)
Term
Epinephrine/norepinephrine
Definition
-beta receptors
-increase Ca, contractility, lower duration
Term
end diastolic volume
Definition
volume in ventricle when it begins to contract
Term
starling curve
Definition
increasing stretch(end diastolic volume) leads to increasing stroke volume
Term
Late diastole
Definition
-both chambers relax
-ventricles fill passively
Term
Atrial systole
Definition
atrial contraction forces small amount of blood in ventricles
Term
isovolumic ventricular contraction
Definition
pushes AV valves closed but cannot open semilunar valves
Term
ventricular ejection
Definition
semilunar valves open as pressure rises
Term
isovolumic ventricular relaxation
Definition
ventricles relax
semilunar valves close
Term
first heart sound
Definition
closing of AV valves
Term
systole
Definition
contraction
Term
diastole
Definition
relaxation
Term
second heart sound
Definition
aortic valve closes
Term
CO =
Definition
HR x SV
Term
HR
Definition
rate of depolarization in autorhythmic cells
Term
SV
Definition
-determined by force of contraction
influenced by contractility and end diastolic volume
Term
sympathetic innnervation
Definition
increases vasoconstriction and contractility
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