HTHSCI 1H06 Chapter Notes -Acetylcholinesterase, Cell Membrane, Muscarine
25 Sep 2013
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Document Summary
Autonomic nervous system: contributes to homeostasis by responding to subconscious visceral sensations and exciting or inhibiting smooth muscle, cardiac muscle, and glands. Includes sensory neurons, integrating centers in cns, autonomic motor neurons, and enteric division. Sensory neurons convey input from receptors for somatic senses (thermal, pain) and from receptors for special senses (sight, hearing, taste) Somatic neurons innervate skeletal muscles, producing both reflexive and voluntary movements. Interoceptors sensory receptors located in blood vessels, visceral organs, muscles, and nervous system that monitor conditions in internal environment. Autonomic motor neurons regulate visceral activities by either increasing or decreasing ongoing activities in effector tissues (cardiac, smooth, glands) Extends from cns to skeletal muscle fibers in motor unit. Consist of two motor neurons in series (one following the other) Autonomic: first neuron has cell body in cns; its myelinated axon extends from cns to autonomic ganglion (collection of neuronal cell bodies in pns).
