Parasympathetic Stimulation of the Heart Generally Leads to a Decrease $\beta$

question 21

Multiple Choice

Parasympathetic stimulation of the heart generally leads to a decrease in heart rate because acetylcholine

• A) increases intracellular cAMP levels and opens calcium channels.
• B) opens potassium channels allowing potassium ion efflux.
• C) binds and blocks \(\beta\) receptors on the cell membrane.
• D) inhibits voltage-gated sodium channels in the membrane.

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