IGCSE Biology Double Award Co-ordination and Response in Humans Notes

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  • Created on: 22-02-13 19:42
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CO-ORDINATION AND RESPONSE IN HUMANS
Nervous: Nerve cell, nervous system, brain, communication. FAST
WORKING.
Hormonal: Hormones made in the endocrine glands and they are
transported around the body in the blood. SLOW/FAST
WORKING.
The central nervous system
consists of the brain and spinal
cord, and it is linked to sense
organs by nerves.
Receptors are groups of specialised cells. They can detect changes in the environment,
which are called stimuli, and turn them into electrical impulses. Receptors are often
located in the sense organs, such as the ear, eye and skin. Each organ has receptors
sensitive to particular kinds of stimulus, e.g. nose to smells.
When a receptor is stimulated, it sends a signal along the nerve cells - neurones - to
the brain. The brain then co-ordinates the response.

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Stimulus ­ The flame.
Receptor ­ The pain sensor in finger.
Effector ­ The arm muscle.…read more

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The eye is the receptor that detects light.…read more

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