Motor Neurons 1 and 2 Start Out Innervating the Same

Multiple Choice

Motor neurons 1 and 2 start out innervating the same number of muscle fibers in a neonatal mouse. If motor neuron 1 releases more acetylcholine in the first two weeks postpartum, ultimately:

A) motor neuron 1 will innervate more muscle fibers.
B) motor neuron 1 will have a thicker axon.
C) motor neuron 1 will be activated prior to motor neuron 2 during muscle contraction.
D) a and b
E) a, b, and c