Health, 28.09.2019 12:20 iancuteodora30

How does norepinephrine, the sympathetic neurotransmitter, increase the heart rate?
a. it shortens the duration of the pace-maker action potentials.
b. it increases coupling among cardiomyocytes.
c. it increases transmission in the bundle of his.
d. it makes the atrioventricular node the primary pace-maker of the heart.
e. it accelerates the recovery phase of the spontaneously pace-maker activity

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How does norepinephrine, the sympathetic neurotransmitter, increase the heart rate?
a. it sh...