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13 Cards in this Set
- Front
- Back
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Main functions |
1. Receive information 2. Process information 3. Coordinate a response to information |
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The nervous system |
Serves as a communication system between the body's internal cells and organs and the external world. |
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The Central nervous system |
Brain and spinal cord -transmits and receives info to and from the PNS to activate appropriate actions, enabling us to adapt to environment -Regulation of all basic bodily processes that keep us alive |
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Brain |
-processes sensory info received through nerve pathways from the body and directs responses -"control centre" |
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Spinal cord |
-receives sensory information from body (via PNS) and sends messages to brain for processing -Receives motion info from brain and sends to body(Via PNS) to control muscles, glands, and organs so action can be taken -can initiate spinal reflex responses |
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Peripheral Nervous System |
Network of nerves located OUTSiDE CNS that transmit info to and from CNS -takes info to CNS from sense organs, muscles and glands (afferent) -takes messages from CNS to rest of body (efferent) -CNS depends on PNS to provide it with info from sense organs about external environment & info about internal environment from body -PNS depends on CNS to process info sent & initiate a response that PNS carries out to various body parts |
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Division of PNS |
Somatic Nervous system Autonomic Nervous system -sympathetic -parasympathetic |
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Somatic Nervous System |
-carries sensory information from receptors to CNS and motor info from CNS to skeletal muscles -sensory info is receives at sensory receptor sites in the body (skin,joints,skeletal, muscles,tendons) & is carried along sensory neural pathways |
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AUTOnomic NS |
-network of nerves that carries messages to and from CNS, internal organs and glands -regulates functioning of internal organs, glands and visceral muscles autonomically -heart rate, breathing, digestion, salivation, perspiration ) -functions fairly independently of CNS as maintaining body's internal states & processes -Particularly active when experiencing extreme emotion e.g. Fear |
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Sympathetic NS |
Activates muscles, organs, & glands to prepare body for vigorous activity or deal with stressful situations to enhance survival Fight or flight response where one can fight the stressor or flight from it |
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Parasympathetic |
Calms or restores the body to normal state of functioning after extreme emotion subsides or threat has passed. |
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What happens during Sympathetic |
-Pupils Dilate -heart beat accelerates -stomach inhibits digestion -pancreas increases glucose -adrenal gland secretes adrenaline/noradrenaline -bladder relaxes -decreased salivation -increases perspiration -bronchioles dilate -sexual organs arouse |
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Parasympathetic |
-pupils contract -heartbeat slows -stimulates digestion -contracts bladder -relaxes sexual organs -salivation increases -bronchioles contract - perspiration decreases |
