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1.2.1 The Heart and Monitoring Heart Function

(a) The Heart















(b) Cardiac Cycle
When the atria contract (atrial systole) the pressure in the atria is greater than the
pressure in the ventricles, forcing blood through the atrioventricular valves and into the
ventricles.
When the ventricles contract (ventricular systole) the pressure…

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(d) 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…

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