Which one of the following is NOT a characteristic of the autonomic efferent system?
A. Innervates blood vessels in skeletal muscle.
B. Hormones regulate effector control.
C. Is usually a two-neuron pathway with a synapse outside the CNS.
D. Activation of effectors is usually voluntary.
E. Neurotransmitters are used for signaling.
ANS: D.
Rationale: Unlike the somatic nervous system, regulation of autonomic functions is typically nonconscious and can be exerted by hormones.
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