Question

nicotinic and muscarinic receptors are receptors to which will bind and alpha and beta receptors are receptors to which will bind.

Explanation:

Nicotinic and muscarinic receptors are types of cholinergic receptors. Cholinergic receptors bind to acetylcholine. Alpha and beta receptors are types of adrenergic receptors. Adrenergic receptors bind to norepinephrine (and epinephrine).

Answer:

First blank: acetylcholine; Second blank: norepinephrine