MSU BIO215 Lecture - Week 14 Objective Assignment

MSU BIO215 Lecture - Week 14 Objective Assignment - BIOL215...

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BIOL215 Lecture Week 14 Objective Assignment Chapter 14: The Autonomic Nervous System Introduction 1. Compare the somatic and autonomic nervous systems relative to effectors, efferent pathways, and neurotransmitters released. Somatic Autonomic Effectors Skeletal muscle Smooth muscle, cardiac muscle, and glands. Efferent Pathways/Ganglia Cell bodies of motor neuron in CNS with axons extending to PNS effectors Chain of two motor neurons with preganglionic cell body in CNS but cell body of postganglionic fiber in PNS ganglia Thick, type A fibers that are heavily myelinated Thinner fibers with light or no myelination Lacks ganglia Autonomic ganglia are the synapse sites of the pre and post ganglionic fibers Neurotransmitter Effects ACH at NMJ is always excitatory Postganglionic fibers on visceral effectors are sympathetic and usually norepinephrine. Parasympathetic and usually ACH. Either NT may be excitatory or inhibitory, depending on receptor type, not the NT chemical itself. Similarities Both are regulated and coordinated by higher brain centers. Several cranial nerves and most spinal nerves contain both types of fibers. Most stimuli trigger coordinated responses of both skeletal muscle and visceral effectors (i.e. exercise).
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BIOL215 Lecture Week 14 Objective Assignment 2. Compare and contrast the general functions of the parasympathetic and sympathetic divisions. Sympathetic
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MSU BIO215 Lecture - Week 14 Objective Assignment - BIOL215...

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