Difficult
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
$(a)$ Central neural system $(CNS)$ and Peripheral neural system $(PNS)$
$(b)$ Resting potential and action potential
$(c)$ Choroid and retina
(A-D) Central neural system $(CNS)$ and Peripheral neural system $(PNS)$
$(b)$ Resting potential and action potential
$(c)$ Choroid and retina
| $(1)$ 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. |
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When we move from darkness into bright light,we cannot see for a short time,but after a while,our vision becomes normal. This is an example of ..........
MediumAIPMT 2001
View SolutionWhich of the following cranial nerves are classified as mixed nerves?
Explain the following processes:
$(a)$ Polarisation of the membrane of a nerve fibre
$(b)$ Depolarisation of the membrane of a nerve fibre
$(c)$ Conduction of a nerve impulse along a nerve fibre
$(d)$ Transmission of a nerve impulse across a chemical synapse
$(a)$ Polarisation of the membrane of a nerve fibre
$(b)$ Depolarisation of the membrane of a nerve fibre
$(c)$ Conduction of a nerve impulse along a nerve fibre
$(d)$ Transmission of a nerve impulse across a chemical synapse
Difficult
View SolutionRead the following statements.
$I.$ Preganglionic nerve fibres of $III, VII, IX$ and $X$ cranial nerves are a part of the parasympathetic nervous system.
$II.$ $V, VII, IX$ and $X$ cranial nerves are mixed nerves.
$III.$ Trochlear nerves are the largest cranial nerves.
$IV.$ Abducens nerves are motor nerves and originate from the Gasserian ganglia.
Which of the above statements are correct?
$I.$ Preganglionic nerve fibres of $III, VII, IX$ and $X$ cranial nerves are a part of the parasympathetic nervous system.
$II.$ $V, VII, IX$ and $X$ cranial nerves are mixed nerves.
$III.$ Trochlear nerves are the largest cranial nerves.
$IV.$ Abducens nerves are motor nerves and originate from the Gasserian ganglia.
Which of the above statements are correct?
Medium
View SolutionNeurosis is characterised by
Medium
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