In spinal reflex pathways, motor neurons receive inputs from
a. sensory afferents and/or internurons.
b. cortical neurons whose cell bodies reside in the primary motor cortex.
c. cortical neurons whose cell bodies reside in the somatosensory cortex.
d. cerebellar neurons.
e. brain stem neurons.
A
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A. The inward Na+ current of an AP generates an AP in an adjacent portion of the axon. B. All APs in a given axon are identical in magnitude and duration. C. APs can be conducted in only one direction. D. The velocity of AP conduction is positively correlated with axon diameter. E. The frequency of APs is limited by the length of the refractory period.