Question

often there are additional muscles that assist the agonist. these muscles are called ( ).
biceps brachii
antagonist
triceps brachii
synergists
prime mover

Explanation:

To solve this, we analyze each option:

• "biceps brachii" and "triceps brachii" are specific muscles, not a general term for assisting muscles.
• "antagonist" muscles oppose the agonist, not assist.
• "prime mover" is another term for the agonist itself.
• "synergists" are defined as muscles that assist the agonist in a movement.

Answer:

D. synergists (assuming the options are labeled A to E with A: biceps brachii, B: antagonist, C: triceps brachii, D: synergists, E: prime mover; if the fourth option is D, then D. synergists)