Nervous System and Reflex Arc

The nervous system helps us to respond to changes in the environment.

nerve cell

central nervous system = brain + spinal cord

stimuli = changes in the environment

receptors = cells that detect stimuli

nerve impulse = electrical message that passes along a neurone

neurone = nerve cells

Five senses:

1. taste
2. smell
3. sight
4. sound
5. touch

 Reflex arc
 Reflex actions are automatic and rapid. We need them to avoid danger.