Chapter 13_ Physiology of the Periph Nervous System Slides.pdf

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Divisions of the Nervous System Central nervous system Brain and spinal cord Peripheral nervous system Somatic motor Autonomic (ANS) Parasympathetic Sympathetic Overview of Autonomic Nervous System Functions Three principal functions Regulate the heart Regulate secretory glands (salivary, gastric, sweat, and bronchial) Regulate smooth muscles (bronchi, blood vessels, urogenital system, and GI tract) Parasympathetic Nervous System (“Rest and Digest”) Seven regulatory functions Slowing the heart rate Increasing gastric secretions Emptying the bladder Emptying the bowel Focusing the eye for near vision Constricting the pupil Contracting bronchial smooth muscle Homeostatic Objectives of SNS Maintenance of blood flow to the brain Redistribution of blood flow during exercise Compensation for loss of blood, primarily by causing vasoconstriction SNS Body Temperature Regulation Regulates blood flow to the skin Dilating surface vessels: accelerates heat loss Constricting cutaneous vessels: conserves heat
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