Which is true when your sympathetic nervous system is more active?
A)The SA node depolarizes more rapidly.
B)The myocardium repolarizes more frequently during one minute.
C)More Ca₂₊ becomes available and causes more forceful heart contractions.
D)Norepinephrine is stimulating the heart.
E)All of the above are true.

Question

Quizplus · Accepted Answer

The sympathetic nervous system increases heart rate and contractility by causing the SA node to depolarize more rapidly, increasing calcium availability for stronger contractions, and norepinephrine stimulates these effects.

Which Is True When Your Sympathetic Nervous System Is More