Question

a muscle and its attached nerve are placed in a bath filled with a succinylcholine solution. succinylcholine binds to the acetylcholine receptor, stimulates an action potential in the muscle, remains bound to the receptor, and prevents further depolarizations. the nerve is electrically stimulated. which of the following will happen? the muscle will contract with every subsequent action potential. the muscle will only contract once and then relax. the muscle will continuously contract. the muscle will not contract.

Explanation:

Succinylcholine binds to acetylcholine receptor, stimulates initial action potential (causing one - time contraction as muscle responds to the initial stimulus). But it remains bound and prevents further depolarizations. So no more action potentials (and thus no more contractions) after the first one. Muscle relaxes after the initial contraction as there's no continuous stimulation due to blocked receptor for further signals.

Answer:

The muscle will only contract once and then relax.