What is the effect of epinephrine on b₃ receptors on the heart?
A)Decreases coronary blood flow
B)Supplements the effects of both b1 and b2 receptors
C)Increases the strength of myocardial contraction
D)Prevents overstimulation of the heart by the sympathetic nervous system

Question

Quizplus · Accepted Answer

b₃ receptors are found in the myocardium and coronary vessels. In the heart, stimulation of these receptors opposes the effects of b₁- and b₂-receptor stimulation and negative inotropic effect. Thus b₃ receptors may provide a safety mechanism that decreases myocardial contractility to prevent overstimulation of the heart by the sympathetic nervous system.

What Is the Effect of Epinephrine on B₃ Receptors on the Heart