Which of the following are known effects of catecholamines?
I.They increase the influx of Ca⁺⁺ into the myocardial cell during the plateau phase of the action potential.
II.They activate beta receptors in the cardiac cell membrane.
III.They raise intracellular levels of cyclic AMP.
IV.They raise intracellular levels of cyclic GMP.

Question

Quizplus · Accepted Answer

Catecholamines are compounds with chemical structures similar to those of epinephrine and norepinephrine. Such drugs increase the influx of Ca⁺⁺ into the myocardial cell during the plateau phase of the action potential. Catecholamines activate beta receptors in the cardiac cell membrane, bringing about a series of chemical events that raise intracellular levels of cyclic adenosine monophosphate (cAMP).

Which of the Following Are Known Effects of Catecholamines