Question

a muscle group that works with and assists the action of a prime mover is a(n):
fixator only
antagonist and synergist
antagonist and fixator
synergist only
antagonist only
question 15
in the sliding filament mechanism, myosin filaments pull actin filaments toward the center of the sarcomere.
true
false

Explanation:

1. For the first question, a synergist is a muscle group that helps and aids the action of a prime - mover. A fixator stabilizes the origin of the prime - mover, and an antagonist opposes the action of the prime - mover.
2. For the second question, in the sliding filament mechanism, myosin filaments use cross - bridges to pull actin filaments towards the center of the sarcomere, which is a fundamental principle of muscle contraction.

Answer:

1. D. synergist only
2. A. True