Which of the following best describes the effect of sympathetic activity on ventricular contractile cells?
A) The rate of contraction and the force of contraction both increase, whereas the rate of relaxation decreases.
B) The rates of contraction and relaxation both decrease, whereas the force of contraction increases.
C) The force of contraction increases, whereas the rates of contraction and relaxation are not affected.
D) The rates of contraction and relaxation both increase, whereas the force of contraction decreases.
E) The rates of contraction and relaxation and the force of contraction all increase.

Question

Quizplus · Accepted Answer

Sympathetic activity increases the rate of contraction, the rate of relaxation, and the force of contraction in ventricular contractile cells due to the action of norepinephrine and epinephrine on beta-adrenergic receptors.

Which of the Following Best Describes the Effect of Sympathetic