PET-3322 Lecture Notes - Lecture 13: Hair Follicle, Blood Vessel, Reflex Arc
5 Nov 2017
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Autonomic nervous system: automatic nervous system (ans) consists of motor neurons that, innervate smooth muscles, cardiac muscles, and glands, make adjustments to ensure optimal support for body activities, operate via subconscious control, also called involuntary nervous system. 14. 1 ans versus somatic nervous system: both have motor fibers but differ in: Effectors: somatic nervous system innervates skeletal muscles, ans innervates cardiac muscle, smooth muscle, and glands. All somatic motor neurons release acetylcholine (ach) Postganglionic fibers release norepinephrine or epinephrine at effectors. Effect is either stimulatory or inhibitory, depending on type of receptors. Overlap of somatic and autonomic function: higher brain centers regulate and coordinate both systems, adaptations usually involve both skeletal muscles and visceral organs. 14. 2 divisions of autonomic nervous system: two arms of ans: Parasympathetic division: promotes maintenance functions, conserves energy. Sympathetic division: mobilizes body during activity: dual innervation: all visceral organs are served by both divisions, but these divisions cause opposite effects.
