What explains the increase in the SA nodal firing rate caused by sympathetic stimulation?

Name: What explains the increase in the SA nodal firing rate caused by sympathetic stimulation?
Brand: Quizplus
Rating: 4.8 (51 reviews)

Question

Quizplus · Accepted Answer

Sympathetic stimulation raises the SA nodal firing rate, conduction rate, and overall cardiac fiber excitability. This is explained by the fact that sympathetic postganglionic fibers release norepinephrine, which increases cardiac fiber permeability to Na? and Ca⁺⁺.

What Explains the Increase in the SA Nodal Firing Rate