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NERVOUS SYSTEMS (peripheral nervous system / outer sensory system (neurons…
NERVOUS SYSTEMS
peripheral nervous system / outer sensory system
efferent (motor) neurons / stuff going to the central point)
somatic nervous system (voluntary)
autonomic nervous system (involuntary)
sympathetic division / creates fight-or-flight response, causes stress and adrenaline
parasympathetic division / keeps you calm
afferent sensory neurons / stuff going away from the central point)
neurons
electrochemical response
node of ranvier (the stems) / signal jumps from each node to be faster
axon hillock (the base of the trunk)
myelin sheath (layer of fat over stem, insulation) / speeds up electrical signal
soma/cell body
dendrite (trunk roots)
central nervous system / receives external signal and sends message to act accordingly
components / gathers info and response to change in environment
brain
spinal cord
instead of brain assessing them first, for involuntary movements the spinal cords respond automatically e.g. taking hand off hot stove
*stimulus (happens first but isn't a component)
receptors / respond to stimulus
sensory neurons / impulses are sent through these to the CNS
CNS coordinates information
motor neurons / sends impulses along these to effectors
effectors / bring on response
response / an external movement
light receptor cells in eyes
hormone-secreting cells in hormone glands
muscle cells
position receptors in inner ear
sound receptors in ear
touch, pressure, temperature and pain receptors in skin
chemical receptors in the nose and tongue
receptors / response to stimulus is coordinated by CNS
stimulus / change in environment to the organism; response keeps organism in favourable conditions; indifference to stimulus means organism won't survive for long