BILD 2 Student Handout 3

BILD 2 Student Handout 3 - BILD 2 Student Handout 3 David...

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BILD 2 Student Handout 3 David Kim ( [email protected] ) Section W 6:00-6:50PM (Center 217A), OH F 10:00-10:50AM (in front of Tap EX) The Nervous system II: CNS and PNS: Billions of ________ cells working together to rapidly transmit signals throughout the body PNS The peripheral nervous system (PNS) o _____________ neurons relay information to the CNS o _____________ neurons send info back to body Structure __________ nerves: Connect brain with regions of head and upper body Most contain both afferent and efferent branches __________ nerves: Consist of afferent and efferent branches from body to spinal cord Divisions of the PNS __________ (voluntary): Controls skeletal muscles __________ (involuntary): Generally control internal organs (e.g. Enteric controls digestive functions)
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Two main branches of autonomic system usually work in opposition to each other _____________: Stimulates organs needed during “fight or flight” response o _________ heart and breathing o Stimulates release of adrenalin o Stimulates release of glucose for energy ____________: Stimulates energy saving responses o Stimulates digestion o _________ heart and breathing to save energy Exercise will stimulate autonomic system like the fight or flight response This will serve to increase cardiac output and respiration Increase blood flow to working skeletal muscles Stimulate sweat production to get rid of excess heat Dilate pupils to assist in eyesight Stimulate energy release to muscles Decrease blood flow to less important body parts digestion
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Increase mean blood pressure (but remember, this will be tempered by decrease of peripheral resistance as local skeletal muscle arterioles vasodilate to allow blood flow into muscles). CNS The central nervous system (CNS) _________: Main integrating center of body ________ _________: lies inside spinal column and helps relay incoming and outgoing messages to brain Development of the Human Brain Structure of the Brain The ___________ Consists of o __________: receives and integrates auditory data; visual center and reflexes o __________: control breathing o ________ __________: controls breathing, circulation, swallowing, digestion Major functions o Homeostasis o Regulate heart rate, breathing rate, digestion, blood vessel constriction o Coordinated movement o Relay information to/from PNS to higher brain regions o Affect attention, alertness, appetite, o Control arousal and sleep
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