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| Introduction |
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| Animals are different from plants because of their ability of locomotion. This ability probably developed as they have to search for food, unlike the plants that are autotrophic. Since they move from place to place, the animals have to continuously encounter changes in their environment. All animals, in order to maintain a steady state within the body (homeostasis), should be able to perceive these changes and adapt to them. |
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| With increasing complexity in their structure, the number and types of cells in the animal body increased. Thus it became necessary to have some coordinating mechanisms. Two systems have been developed for better control and coordination of the various activities of the organisms. These systems are nervous system and endocrine system. |
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| The nervous system is made up of units called the neurons which relay information by generating electric potential. |
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Nervous Coordination and Integration
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