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28 Cards in this Set
- Front
- Back
function of nervous system
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master regulatory system that coordinates body function
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3 functional types of neurons
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sensory input, integration, motor output
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describe sensory input
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info detected by sensory receptors
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describe integration
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sensory input is processed and interpreted
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motor output
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response is made by organs
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give example
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red light
see-sensory input nervous system integrates this info(red light means stop send motor output to leg-btake |
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whate system works with nervous system to regulate
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endocrine
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how is nervous system organized
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structural
functional |
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what is structural classification
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cns-brain and spinal cord
pns(peripheral)- nerves that extend from brain and spinal cord (cranial and spinal nerves) |
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what is functional classification
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sensory or afferent division- nerve fiber conveys ompulses TO cns from sensory receptors
motor or efferent division-- carries impilses FROM cns to muscles and glands |
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somatic nervous system
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volntary
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autonomic
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involuntary
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what kind of signals do cells of nervous system use
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electrochemical
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how do cells of nervous system react
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rapid
specific immediate response |
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what are 2 types of cells
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neuron and neurological
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what are neuron cells
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principle type, transmit and are generic
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neurological cells
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variety of other types
provides insulation, support, nourishment for neurons |
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what are nerve impulses
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electrochemical signals
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what are parts of neuron
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cell body
dendriteinput receives signals axon output transmit signals nerve fibers axon&dendrite nerve-bundle of fibers |
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what is axon terminal
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releases neurotransmitter info
flows in one direction |
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myelin sheath
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elec insulation around axon
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myelin
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lipid substance in cell membrane in some neurological cells
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schwann cells
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neurological cells in PNS that wrap around axon. they form myelin sheath
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nodes of ranvier
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gap between schwann cells
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structural types of neurons
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mulitpolar, bipolar,
unipolar |
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multipolar
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1 axon and many dendrites-most common
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bipolar
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1 axon 1 dendrite found in specialized area of eyes ears nose
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unipolar
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1 nerve fiber extends from cell body and splits
1 branch comes from periphery and acts as dendrite other brsanch runs toward cns acts as axon found in ganglia(PNS) |