Question

Epinephrine stimulates which of the following receptor sites?

a. α
b. β1
c. β2
d. All of the above

Answer 1

Epinephrine stimulates α, β1, and β2 receptor sites.

Step-by-step explanation:

Epinephrine stimulates all of the following receptor sites: α, β1, and β2. Epinephrine acts through both α-adrenergic and β-adrenergic receptors. α₁ receptors are responsible for vasoconstriction of arteries to the heart, while α₂ receptors inhibit insulin release in the pancreas. β1 receptors increase heart muscle contraction, while β2 receptors cause smooth muscle relaxation and glycogenolysis. Therefore, the correct answer is d. All of the above.