chapter 15 HO - Chapter 15 Autonomic Nervous System...

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Chapter 15 Autonomic Nervous System
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Introduction/Review Somatic nervous system includes both sensory & motor neurons: --- somatic sensory neurons convey input from receptors for somatic senses (tactile, thermal, pain, etc.)---perceived consciously --- somatic motor neurons innervate skeletal muscles and produce vol. movement The major input for the ANS comes from autonomic sensory neurons with the help of intereceptors---receptors located in blood vessels, visceral organs---muscle Examples: --- chemoreceptors : monitor blood CO2 levels --- mechanoreceptors : detect the degree of stretch in the walls of organs or blood vessels These sensory signals are not typically perceived consciously
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Introduction Autonomic Motor Neurons: regulate activities by either exciting or inhibiting activities in their effector tissues (e.g. cardiac muscle, smooth muscle, glands) Examples: ---change in the diameter of pupils ---dilation + constriction of blood vessels ---adjusting rate of heartbeat Interesting factoid: Tissues regulated by the ANS can sometimes function even when their nerve supply is damaged ---heart still beats when removed for transplantation ---glands produce secretions in the absence of ANS control
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Motor Neuron Pathway of ANS Axon of a somatic motor neuron from CNS extends all the way to the skeletal muscle fiber Autonomic motor pathways consists of two motor neurons (1 following the other) ---The cell body of the first neuron is in the CNS, its axon extends to an autonomic ganglion (group of cell bodies in the PNS), the cell body of the second neuron extends from the ganglion to the effectors (glands, smooth muscle, cardiac muscle) ---All somatic motor neurons only release acetylcholine, while autonomic motor neurons release either acetylcholine or norepinephrine
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This note was uploaded on 07/06/2011 for the course CHM 151 taught by Professor Darryl during the Spring '11 term at Arizona Western College.

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chapter 15 HO - Chapter 15 Autonomic Nervous System...

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