Sense Organs as Receptors
- Receptors are groups of specialised cells
- They detect a change in the environment and stimulate electrical impulses in response
- Sense organs contain groups of receptors that respond to specific stimuli
| Sense Organ | What it is sensitive to | Sense |
| Skin | Heat and cold, pressure, painĀ | Touch (pressure) and temperature |
| Tongue | Chemicals in food and drink | Taste |
| Nose | Chemicals in the air | Smell |
| Ear | Sounds and movement | Hearing and balance |
| Eye | Light | Sight |
- Once the receptor cell in the sense organ has been stimulated, it generates an electrical impulse
- This is passed on to a sensory neurone which carries the impulse to the central nervous system
- Here a response will be decided on and the impulse will be passed to a motor neurone (via a relay neurone)
- The motor neurone carries the impulse to the effector (muscle or gland)
- The effector carries out the response
