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Biology, 31.08.2019 14:30 amanda2517

What is a role of the pacemaker or sinoatrial node (san)?
a. to initiate contraction of the ventricle
b. to pass the excitation through purkinje fibres
c. to originate excitation in myogenic muscle
d. to cause the relaxation of the atria

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What is a role of the pacemaker or sinoatrial node (san)?
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