Question 2: Compare the following:
(a) Central neural system (CNS) and Peripheral neural system (PNS)
(b) Resting potential and action potential
(c) Choroid and retina
Answer:
(a) Central neural system (CNS) and Peripheral neural system (PNS)
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Central neural system
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Peripheral neural system
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1.
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It is the main coordinating centre of the body.
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1.
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It is not the main coordinating centre of the body.
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2.
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It includes brain and spinal cord.
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2.
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It includes cranial and spinal nerves that connect central nervous system to different parts of the body.
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(b) Resting potential and action potential
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Resting potential
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Action potential
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1.
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It is the potential difference across the nerve fibre when there is no conduction of nerve impulse.
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1.
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It is the potential difference across nerve fibre when there is conduction of nerve impulse.
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2.
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The membrane is more permeable to K+ ions than to Na+ ions.
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2.
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The membrane is more permeable to Na+ ions than to K+ ions.
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(c) Choroid and retina
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Choroid
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Retina
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1.
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Choroid is the middle vascular layer of eye.
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1.
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Retina is the innermost nervous coat of eye.
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2.
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It contains numerous blood vessels that provide nutrients and oxygen to retina and other tissues.
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2.
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It contains photoreceptor cells, rods and cones that are associated with twilight and colour vision respectively.
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Comments
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