A stimulus is a change in your enviroment whihc you may need to react
- You have five different sense organs = eyes, ears, nose, tongue and skin.
- They all contain different receptors. Receptors are groups of cells which are sensitive to a stimulus. They change stimulus energy (e.g light energy) into electrical impulses.
- A stimulus can be light, sound, touch, pressure, pain, chemical, or a change in position or temperature