If the EDV were held constant, increased stroke volume could be accomplished by
A) increased sympathetic nerve activity to the heart.
B) increased parasympathetic nerve activity to the heart.
C) decreased contractility.
D) sleep.
E) increased arterial blood pressure.

Question

Quizplus · Accepted Answer

Increased sympathetic nerve activity to the heart would increase the strength of the heart's contractions, resulting in increased stroke volume. This is due to the increased release of norepinephrine, which binds to beta-adrenergic receptors on the heart, stimulating the production of cyclic AMP, which then activates protein kinase A to phosphorylate proteins involved in contraction, leading to increased contractility.

If the EDV Were Held Constant, Increased Stroke Volume Could