The Enzyme That is Partly Responsible for Shutting Down a Muscle

Question

The enzyme that is partly responsible for shutting down a muscle contraction is ________.
A) actinin
B) actinase
C) acetylcholinesterase
D) titin
E) glycolytic enzyme

Accepted Answer

Acetylcholinesterase is responsible for breaking down the neurotransmitter acetylcholine at the neuromuscular junction, which signals the muscle fibers to contract. Once acetylcholine is broken down, the signal to contract is stopped, and the muscle can relax. Therefore, acetylcholinesterase is partly responsible for shutting down a muscle contraction.