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The Nervous System
...
Changes in
your environment that you need to react to are called stimuli
...
The sense organs have
different receptors, groups of
cells that are sensitive to
certain stimuli
...
Li htr
Sound and "balance"
tors
tors —sensitive to chemical stimuli
...
These are all chemical stimuli
...
The receptors change the energy of the stimuli into electrical signals called impulses, which then
travel to the brain
...
The Central Nervous System - (CNS)
...
The CNS consists of the spinal cord and the brain
...
—
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
...
The impulse travels along the
motor
neurone to effectors, muscles in the
hand
...
9+itnulafionof
the pain recepfor
1