Question

when rowing, the trapezius contracts. what muscle would be an antagonist during this motion? a) external obliques b) pectoralis major c) biceps brachii
muscles that work alongside the prime mover are called __________.

Explanation:

1. In muscle - movement relationships, an antagonist muscle opposes the action of a prime - mover muscle. During rowing, when the trapezius contracts, the biceps brachii is not directly involved in the same motion as the trapezius and can act as an antagonist in some aspects of the shoulder and arm movements related to rowing. The external obliques are mainly for trunk rotation and lateral flexion, and the pectoralis major is more involved in horizontal adduction of the arm rather than being a direct antagonist to the trapezius during rowing.
2. Muscles that work alongside the prime - mover are called synergists. They assist the prime - mover in performing a particular action.

Answer:

1. c) Biceps brachii
2. Synergists