Biology 1001A Study Guide - Quiz Guide: Preganglionic Nerve Fibers, Adrenal Medulla, Autonomic Ganglion

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9 Nov 2020
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General visceral motor system - most effectors (organs & tissues regulated) are visceral (as opposed to somatic - skeletal muscle & joints) Autonomic - organs, glands, smooth & cardiac muscle. Somatic - one motor neuron from cns to skeletal muscle. Action of neurotransmitters: somatic - acetylcholine (ach); stimulatory, autonomic - post ganglionic neurons may release either ach or norepinephrine (ne); whether response is stimulatory or inhibitory depends on the effector, coordination of somatic and autonomic systems. Both systems send their motor neurons to effectors via the 31 pairs of spinal nerves and 12 pairs of cranial nerves. When skeletal muscle is active, autonomic must regulate other body activities for sufficient blood, oxygen, waste removal. Divisions of the autonomic nervous system - the sympathetic and parasympathetic divisions work in contrasting fashion to stimulate and inhibit effectors. Parasympathetic division - the "resting and digesting" system, keeps body calm, stimulates digestion, urination, and defecation.

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