Compare the following : (a) Central nerual system (CNS) and Peripheral neural system (PNS). (b) Resting potential and actions potential . (c ) Choroid

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answered Nov 8, 2019 by JeevikaKumari (62.5k points)
edited Jan 25, 2024 by Vikash Kumar

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(a) Central neural system (CNS) and Peripheral neural system (PNS).

Central Neural System	Peripheral Neural System
1. Central neural system is the main 1. coordinating centre of the body. 2. It includes brain and spinal cord.	1. Peripheral neural system is not the main coordinating centre of the body. 2. It includes cranial and spinal nerves that connect central nervous system to different parts of the body.

(b) Resting potential and actions potential .

Resting Potential	Action Potential.
1. Resting potential is the potential difference across the nerve fibre when there is no conduction of nerve impulse. 2. The membrane is more permeable to K⁺ ions than to Na⁺ ions.	1. Action potential is the potential difference across nerve fibre when there is conduction of nerve impulse. 2. The membrane is more permeable to Na⁺ ions than to K⁺ions.

(c ) Choroid and retina.

Choroid	retina
1. Choroid is the middle vascular layer of eye. 2. It contains numerous blood vessels that provide nutrients and oxygen to retina and other tissues.	1. Retina is the innermost nervous coat of eye. 2. It contains photoreceptor cells, rods and cones that are associated with twilight and colour vision respectively.