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Norepinephrine acts on the heart by ________.

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Final answer:

Norepinephrine acts on the heart by binding to beta-1 receptors, which increases the rate of depolarization and contraction, resulting in an increased heart rate.

Step-by-step explanation:

Norepinephrine acts on the heart by binding to the beta-1 receptors of the cardiac muscle cell membrane. This binding opens chemical- or ligand-gated ion channels, allowing an influx of positively charged ions. As a result, the rate of depolarization and contraction increases, leading to an increase in heart rate (HR).

User Guilherme Franco
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Causing the threshold to be reached more quickly
User Nhat Nguyen
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