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Stack #33651

Heart #4

QuestionAnswer
autorhythmic cells specialized to produce & distribute impulses thru the heart
sinoatrial SA node-pacemaker initiates each cardiac cycle
atrioventricular AV node reccieves energy from SA node
AV bundle of his is a tract of conducting fibers that runs thru...
R & L bundle branches split from AV bundle and travel...
Purkinje fibers emerge from L & R bundles and pass into cells of myocardium
cardiac centers are located in the medulla oblongata
autonomic ervous sys acts as both an: accelerator as well as a braking sys; modifies but does not directly control
sympathetic branch of the ANS: increases rate and force of heartbeat during stress; called the Accelerator
parasympathetic branch of ANS: slows H when stress ends; Includes chemicals and ions. Called Brakes
Cardiac Cycle: all events associated with the flow of blood thru H during 1 complete heartbeat
Systole Contraction
Diastole Relaxation
1 compleat heartbeat = cardiac cycle
blood flow thru heart is totally controlled by pressure changes
blood flows along a pressure gradient from: higher to lower pressure thru any available opening
During atrial diastole the atria fill w/blodor
During atrial systole the artia contract & ventricles begin to fill
Ventricular systole forces blood: out into the aorta and pulmonary arteries
Cardia Output = CO
CO amt B pumped out by each ventricle in one minute
CO is the product of: heart rate (HR) & stroke volumn (SV)
HR heart rate
SR stroke volumn
HR X SV = CO
stroke volumn (SV) is volumn of B pumped out by a ventricle w/each beat
SV is correlated to the force: of the ventricular contraction
main factor controlling SV is: preload (degree of stretch of cardiac muscles just prior to contraction)
Frank Sterling Law refers to main factor controlling SV
normal vol of B is 5 liters and it goes thru H in 1 minute
 

 



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