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