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The Nervous System
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Changes in
your environment that you need to react to are called stimuli
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The sense organs have
different receptors, groups of
cells that are sensitive to
certain stimuli
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Li htr
Sound and "balance"
tors
tors —sensitive to chemical stimuli
...
These are all chemical stimuli
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The receptors change the energy of the stimuli into electrical signals called impulses, which then
travel to the brain
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The Central Nervous System - (CNS)
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The CNS consists of the spinal cord and the brain
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—
sensory
neurone
neurone
stimulus
effector (muscfe)
A stimulus detected by receptor cells in a sense organ is changed into an electrical impulse
The impulse is sent along a sensory neurone to the CNS
...
The effectors, either muscies or giands respond to the impulse —
contract and glands secrete hormones
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The impulse travels along the
motor
neurone to effectors, muscles in the
hand
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9+itnulafionof
the pain recepfor
1