Question

select the correct answer.
what must skeletal muscles do to move?
a. engage their fibers slowly
b. twitch involuntarily
c. separate from the bone
d. contract and relax

Explanation:

Skeletal muscles work by contracting and relaxing. When they contract, they pull on bones to cause movement. Relaxation allows for the return to the original position. Options A (engage their fibers slowly - not the main action for movement), B (twitch involuntarily - skeletal muscles are voluntary), and C (separate from the bone - not how movement occurs) are incorrect.

Answer:

D. contract and relax