Stimulus - things that set off a reaction in the nervous system
Receptor - a specialised nerve cell which is adapted to respond to a stimulus
Co-ordinator - usually the brain which organises the processes within the body
Neurone - Nerve cells
Sensory Neurone - nerve cells which carry signals from receptors to the spinal cord and brain
Synapse - a tiny gap where two neurones meet
CNS - Central Nervous System
Motor Neurones - They carry signals from the CNS to effectors.
Nerve Impulse - an electrical current that travels along dendrites or axons
Response - the action that happens after a responding neurone is sent to a muscle e.g the jerk of an arm away from a flame.
Effector - any part of the body that produces the response
The eye 1
- There are two groups of light receptor cells - rods and cones. The rods respond to shades of light (black and white), while the cones respond to colours of light - red, blue and green