Stimulation of the beta receptors on heart muscle cells results in
A) the formation of cAMP.
B) increased heart rate.
C) increased force of contraction.
D) all of the above
E) none of the above

Question

Quizplus · Accepted Answer

Stimulation of the beta receptors on heart muscle cells leads to the activation of the enzyme adenylyl cyclase, which converts ATP to cyclic AMP (cAMP). cAMP activates protein kinase A, which phosphorylates various proteins leading to an increase in heart rate and an increase in the force of contraction. Therefore, all of the above choices (A, B, and C) are correct.

Stimulation of the Beta Receptors on Heart Muscle Cells Results