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(A-D) Central neural system $(CNS)$ and Peripheral neural system $(PNS)$						$(1)$ Central neural system $(CNS)$ is the main coordinating centre of t

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(A-D) Central neural system $(CNS)$ and Peripheral neural system $(PNS)$

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

$(b)$ Resting potential and action potential

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

$(c)$ Choroid and retina

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

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

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