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Regulation of the heart by the Nervous System?

a.
Activation of adrenergic receptors on cardiomyocytes leads to an increase in stroke volume by increasing the force of cardiomyocyte contraction.

b.
Acetylcholine is released from sympathetic neurons and causes a decrease in the firing rate of sinoatrial node cells.

c.
Norepinephrine binds to muscarinic G protein-coupled receptors and causes an increase in heart rate.

d.
Both (a) and (b) are correct and (c) is incorrect

e.
Statements (a), (b) and (c) are all correct

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