What allows you to lift different weights with the same muscle is the
A) difference in the threshold stimulus
B) number of motor units used by the muscle
C) all-or-none law
D) isometric contraction of the muscle fibers

Question

Quizplus · Accepted Answer

The number of motor units used by the muscle allows you to lift different weights with the same muscle. When lifting a lighter weight, fewer motor units are recruited, whereas when lifting a heavier weight, more motor units are recruited. This allows for a graded response and the ability to lift different weights with the same muscle. The threshold stimulus (A) refers to the minimum level of stimulation required to generate a muscle contraction and is not directly related to lifting different weights. The all-or-none law (C) states that a muscle fiber will either contract completely or not at all in response to a stimulus, so it does not explain how different weights can be lifted. Isometric contraction (D) involves the muscle fibers contracting without producing movement and is not directly related to lifting different weights.

What Allows You to Lift Different Weights with the Same