The of the internal conditions of a to maintain conditions for , in response to internal or external .
Controlled internal conditions include: - - -
Receptors: cells that may be in the or
Coordination centres: areas that from receptors includes the , and
Effectors: that bring about response respond to received stimulus restore conditions to optimum through changes
The nervous system carries impulses between metres per second
Stimulus
| Receptor
| ()
Coordinator ( )
Effector ( may contract may secrete chemicals )
The sends an impulse along a , carrying information about a change in the environment to the coordinator (). Once all incoming information has been processed, the coordinator sends an impulse along the , which stimulate the needed in a particular circumstance.
Experiments to measure reaction times: - ( reaction to visual stimulus ) - hand squeeze around circle ( )
