Chapter 15 Lecture Outline - Palm Beach State College
Chapter 15 Lecture Outline
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1
Introduction
? Autonomic means "self-governed"; the autonomic nervous system (ANS) is independent of our will
? It regulates fundamental states and life processes such as heart rate, BP, and body temperature
? Walter Cannon coined the terms "homeostasis" and the "flight-or-fight"
? He dedicated his career to the study of the ANS ? Found that animals without ANS cannot survive on their
own (must be kept warm and stress-free)
15-2
General Properties of the Autonomic Nervous System
? Expected Learning Outcomes
? Explain how the autonomic and somatic nervous systems differ in form and function.
? Explain how the two divisions of the autonomic nervous system differ in general function.
15-3
General Properties of the Autonomic Nervous System
? Autonomic nervous system (ANS)--a motor nervous system that controls glands, cardiac muscle, and smooth muscle
? Also called visceral motor system ? Primary organs of the ANS
? Viscera of thoracic and abdominal cavities ? Some structures of the body wall
? Cutaneous blood vessels ? Sweat glands ? Piloerector muscles
15-4
General Properties of the Autonomic Nervous System
(continued) ? Autonomic nervous system (ANS)
? Carries out actions involuntarily: without our conscious intent or awareness
? Visceral effectors do not depend on the ANS to function; only to adjust their activity to the body's changing needs
? Denervation hypersensitivity--exaggerated responses of cardiac and smooth muscle if autonomic nerves are severed
15-5
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