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

Question

Quizplus · Accepted Answer

Sympathetic activity increases the rates of contraction and relaxation as well as the force of contraction in ventricular contractile cells due to the release of norepinephrine, which enhances calcium influx and uptake.

Which of the Following Best Describes the Effect of Sympathetic