Question
The main physiological function of muscle is to A. Expand B. Contract C. Relax D. Extend
Answer
4.6
(230 Votes)
Millie
Professional · Tutor for 6 years
Answer
B
Explanation
The main physiological function of muscles is based on their ability to contract and relax to generate movement. When muscles contract, they shorten to pull on tendons and generate body motions or maintain body positions. Muscles relax when they are not contracting to put forth a force. Meanwhile, an expansion and extension of a muscle doesn't represent its physiological function since muscles don't actually expand or extend - they change shape by contracting or relaxing to generate movement.