Beta receptors
A)are especially sensitive to epinephrine and relatively unresponsive to norepinephrine.
B)respond by opening ion channels that hyperpolarize the plasmalemma in heart muscle cells.
C)may produce inhibition only.
D)cause constriction of blood vessels in skeletal muscles.
E)may produce excitation only.

Question

Quizplus · Accepted Answer

Beta receptors are more sensitive to epinephrine than norepinephrine, which is why option A is correct. They can produce both excitation and inhibition, depending on the tissue type, and do not exclusively cause hyperpolarization or constriction in skeletal muscles.

Beta Receptors