HORMONES screted by special gland are CHEMICALS that help to control and co-ordinate processes in the body.
THE NERVOUS SYSTEM uses electrical impulses to enable you to react to your Surroundigsand co-ordinate what you do.
Cells called receptors detect stimuli (Changes in the enviroment).
IMPULSES from the receptors pass along sensory neurones to the brain, impulses are sent from the brain to the effector organs along motor neurones.
Some RESPONSES to stimuli are automatic and rapid and are called relfex actions.
Reflex actions run everyday bodily functions and help you to avoid danger.
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