Summary: Cardiovascular System 4
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1.28 cardiovascular system 4
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intrinsic conduction system explained
heart muscle cells contract without nerve impulses in a regular continuous way -
sequential contractions of myocardium are caused by
flow of action potentials -
cardiac muscle fibers help
carry action potentials
contract as action potential propagate -
atrioventricular node location
at the junction of the atria and ventricles -
bundle branch location
in the interventricular septum -
spread within the ventricle wall muscles
purkinje fibers -
action potential first go through
walls of atria (contract) -
when action potential reaches __ it pauses and then regenerates
atrioventricular node -
flow of action potentials process
SA nodes are autorhythmic
AP propagates through walls of atria
AP reach AV nodes, pauses and regenerates
AP propagates through through AV bundles and bundle branches
side branches activates papillary muscles
AP reaches apex of heart
APs flow upwards along walls of ventricles -
heart contraction is initiated by the
sinoatrial node
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