Stimulation of the Beta Receptors on Heart Muscle Cells Results

Question

Stimulation of the beta receptors on heart muscle cells results in
A) the decrease in ATP production.
B) increased heart rate and force of contraction.
C) decreased force of contraction.
D) slower heart rate.
E) inhibition of the heart muscle.

Accepted Answer

Stimulation of beta receptors on heart muscle cells leads to the activation of cAMP second messenger system, which in turn activates protein kinase A, leading to increased calcium entry into the cells. This results in increased heart rate and force of contraction.