Select the statement that best describes the involvement of the sympathetic and parasympathetic nervous system in the movement of feces.
A. Stimulation of the cholinergic fibers that innervate the intestines increases intestinal motility, whereas stimulation of the adrenergic fibers decreases motility.
B. Stimulation of either the cholinergic fibers or the adrenergic fibers that innervate the intestines decreases intestinal motility.
C. Stimulation of the adrenergic fibers that innervate the intestines increases intestinal motility, whereas stimulation of the cholinergic fibers decreases motility.
D. Stimulation of either the cholinergic fibers or the adrenergic fibers that innervate the intestines increases intestinal motility.
Answer: A
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