Each of these statements is true except one. Identify the exception.
A) Monoamine oxidase is the main enzyme responsible for the degradation of catecholamines.
B) ß1 receptors respond equally well to both epinephrine and norepinephrine.
C) ß2 receptors are not innervated by sympathetic neurons, so are more sensitive to epinephrine, delivered via the blood.
D) Activation of a receptors opens Na+ channels in the membrane.
Answer: D