Identify the Incorrect Statement About a Single Motor Unit

Question

Identify the incorrect statement about a single motor unit.
A) The more neurons involved, the more powerful the contraction.
B) The smaller the number of muscle fibers, the more precise the movement.
C) Fine motor skills depend on the development of small motor units.
D) Some motor units include as many as 2000 muscle fibers.
E) Muscle fibers of one motor unit intermingle with the fibers of another motor unit.

Accepted Answer

The statement "The more neurons involved, the more powerful the contraction" is incorrect because the power of a contraction is not determined by the number of neurons involved, but by the number of muscle fibers activated within the motor units. A single motor neuron innervates multiple muscle fibers in a motor unit, and the strength of a contraction is influenced by the number of motor units activated and the size of those units, not the number of neurons.