Which is true when you are sympathetically stimulated? A) the SA node depolarizes more rapidly. B) the myocardium repolarizes more rapidly. C) more Ca²⁺ results in more sarcomere crossbridge attachments. D) norepinephrine is stimulating the heart. E) all of these answers.

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Quizplus · Accepted Answer

Sympathetic stimulation increases heart rate by causing the SA node to depolarize more rapidly, enhances myocardial contractility by increasing calcium availability for crossbridge formation, and involves norepinephrine as a neurotransmitter.

Which Is True When You Are Sympathetically Stimulated