Dec 3, 2014

Coordination in Animals

Irritability or sensitivity is a characteristic feature of all living organisms and refers to their ability to respond to a stimulus. Any thing that causes activity or change in activity in an organism is called stimulus (plural: stimuli) or anything that starts a nerve impulse.


Reaction to the stimulus is known as response. The stimulus is received by a receptor. The structures that give responses, when they are stimulated by nerve impulse or hormones are called effectors. The main effectors are muscles and glands. Animals have two different but related system of co-ordination, the nervous system and endocrine system.

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