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Distinguish between (a) Central nervous system and peripheral nervous system (b) Receptor and effector.

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(a)

Central nervous system Peripheral nervous system
1. It consists of Brain and spinal cord. 1. It consists of nerves that arise from brain and spinal nerves.
2. Both of them have nerve cells and glial cells. 2. It has 43 pairs of nerves. Among them 12 pairs are cranial nerves and 31 pairs are spinal nerves.
3. Brain and spinal cord receive information. 3. The cranial nerves carry information to the same organs and spinal nerves from organs to spinal cord.

(b)

Receptor Effector
1. Receptors are the special cells that respond to stimulus. 1. Effectors are the organs that produce the response.
2. These are present in the sense organs. 2. Effectors are present in any part of the body.
3. These send the information to central nervous system. 3. These follow the commands of central nervous system.

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