Question

a muscle or group of muscles opposing an action is called the
prime mover
antagonist
weight
agonist
question 53
if the nerve impulse does not reach the required magnitude, only some of the muscle fibers will contract.
true
false
question 54
whether or not a motor unit activates upon the arrival of an impulse depends on the

Explanation:

1. For the first question, in muscle - related terminology, an antagonist is a muscle or group of muscles that opposes an action.
2. For the second question, according to the all - or - none law of muscle contraction, if the nerve impulse does not reach the required magnitude (threshold), no muscle fibers will contract, not just some. So the statement is false.

Answer:

1. Antagonist
2. False