Question

multiple choice question
the more precise control that is needed to perform a motor movement requires a ______ motor unit.
larger (1 axon per 200 muscle fibers)
smaller (1 axon per 20 muscle fibers)

Explanation:

Precise motor movements require more individualized control. A smaller motor unit, with fewer muscle - fibers per axon (1 axon per 20 muscle fibers), allows for more precise control as each axon can more finely regulate a smaller number of muscle fibers. In contrast, a larger motor unit with 1 axon per 200 muscle fibers is better for generating more force but less for precision.

Answer:

smaller (1 axon per 20 muscle fibers)