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What are the functions of the nervous system?
- keeps us in touch with both internal/external env
- serves as control center & communication network
- stores & processes info
- stimulates mvmt
- detects change
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When working with the endocrine system, what does the nervous system do?
Helps maintain homeostasis
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The study of behavior & the fn & process of the mind is?
Psychology
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What do sensory or afferent receptors do?
detect changes that occur inside & outside the body & convey them to brain
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How does the nervous system respond to afferent receptors?
send motor/efferent signals from brain to muscles/glands to cause effect
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somatic nervous system
- part of nervous system
- conscious/voluntary control
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autonomic nervous system
- part of nervous system
- relates to involuntary/automatic body fns
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somatic
pertains to the body
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2 main divisions of nervous system
- central nervous system (CNS)
- peripheral nervous system (PNS)
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Peripheral nervous system
various nerve processes that connect brain and spinal cord w/receptors, muscles & glands
- sensory (afferent)
- motor (efferent)
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CNS: Brain
- receives & integrates data
- regulates body activities
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CNS: Spinal cord
- carries info to and from brain
- provides reflexes
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PNS: sensory/afferent
conveys info from receptors to CNS
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PNS: motor/efferent
conveys info from CNS to muscles & glands
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peripheral
away from the center
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nervous system composed of 2 types of cells
- neurons
- glial (neuroglial)
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Fns of neurons
conduct impulses to or from nervous system
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cytoplasmic projections of neuron
- single axon
- several dendrites project from cell body
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Dendrite fn
transmit impulses to cell body
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axon fn
carries impulses away from cell body
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myelin sheath
- white fatty covering surrounding many axons
- conducts nerve impulses faster than non-myelinated axons
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neurilemma (neurolemma)
outermost layer of axon
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neuroglia or glia fn
- support tissue cells of nervous system
- provide support & protection
- can replace themselves
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structure of typical neuron
- cell body
- single axon
- several dendrites
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node of ranvier
un-myelinated parts of myelinated axons
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cerebr/o, encephal/o
brain
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coccyg/o
coccyx (tailbone)
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gli/o
neuroglia or a sticky substance
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kerat/o
cornea; hard or horny
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myel/o
bone marrow or spinal cord
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phren/o
mind or diaphragm
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-esthesia
sensation, perception
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