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The heart

the four chambered heart consists largely of cardiac muscle which is myogenic : It
rhythmically contracts and relaxes of its own accord. This is not due to nervous
stimulation.





13:

The cardiac cycle refers to a sequence of events which takes place during the
beating of the heart.…

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the pumping action consists of alternating contractions: Systole and relaxations:
Diastole.
The cardiac cycle refers to a sequence of events which takes place during one
heartbeat
Atrial systole ­ atria contract, pressure increases, blood forces through the
atrioventricular valves to the ventricles
Ventricular systole ­ ventricles contract, AV valves close…

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