Answer
(c) synergist
Work Step by Step
Synergists help prime movers in one of these ways: Adding a little extra force to the same movement or reducing undesirable or unnecessary movements that might occur as the prime mover contracts (page 318).
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.