Which of the Following is Most Descriptive of Dual Innervation

Question

Which of the following is most descriptive of dual innervation of the autonomic nervous system?
A) Muscarinic and nicotinic
B) Alpha and beta
C) Sympathetic and parasympathetic
D) Beta1 and beta2

Accepted Answer

Dual innervation refers to organs or tissues that receive input from both the sympathetic and parasympathetic divisions of the autonomic nervous system. Muscarinic and nicotinic receptors are specific types of receptors found in both divisions. Alpha and beta receptors are specific types of adrenergic receptors found in the sympathetic division. Beta1 and beta2 are subtypes of beta adrenergic receptors. Therefore, the most descriptive of dual innervation of the autonomic nervous system is the choice that refers to the two divisions: sympathetic and parasympathetic (C).