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Electrical Activity
Cardiac muscle is myogenic meaning it does not
require stimulation from the nervous system to
contract.
The SAN produces an impulse that passes across to
the atria causing atrial systole. The impulse stops at
a ring of fibres before passing onto the ventricle
via the AVN which acts as a relay point. From the
AVN impulses pass down to the heart muscle to the
bundle of His. The impulse then divides down the
purknyne fibres causing the ventricle to contract
called ventricular systole.…read more

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