A STIMULUS is a change in your environment, which you may need to react to.
For example, a grizzly bear looking hungrily at you
You have 5 different sense organs - eyes, ears, nose, tongue and skin.
These 5 sense organs all contain different RECEPTORS
Receptors = groups of cells- sensitive to a stimulus.
They change stimulus energy (eg light energy) into electrical impulses.
A stimulus can be light, sound, touch, pressure, pain, chemical or a change in position or temperature.
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