Compare the following: (a) Central neural system (CNS) and Peripheral neural system (PNS) (b) Resting potential and action potential (c) Choroid and retina

(a) Central neural system (CNS) and Peripheral neural system (PNS)
Central Neural System:-
1. Central neural system is the main coordinating centre of the body.
2. It includes brain and spinal cord.
Peripheral Neural System:-
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 action potential
Resting Potential:-
1. Resting potential is the potential difference across the nerve fibre when there is no conduction of
2. The membrane is more permeable to K+ ions than to Na+ ions.
Action Potential:-
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:-
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.
Retina:-
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.

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