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प्रश्न
Which of the following statements is wrong regarding conduction of nerve impulse?
विकल्प
In a resting neuron, the axonal membrane is more permeable to K+ ions and nearly impermeable to Na+ ions.
Fluid outside the axon has a high concentration of Na+ ions and low concentration of K+, in a resting neuron.
Ionic gradient s are maintained by Na+ K+ pumps across the resting membrane, which transport 3Na ions outwards for 2K+ into the cell.
A neuron is polarized only when the outer surface of the axonal membrane possess a negative a charge and its inner surface is positively charged.
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उत्तर
A neuron is polarized only when the outer surface of the axonal membrane possess a negative a charge and its inner surface is positively charged.
संबंधित प्रश्न
Receptor, Spinal cord, Effector, Motor neuron, Sensory neuron.
The diagram given below is a representation of a certain phenomenon pertaining to the nervous system. Study the diagram and answer the following questions:
(i) Name the phenomenon which is being depicted.
(ii) Give the technical term for the point of contact between the two nerve cells.
(iii) Name the parts 1, 2, 3, and 4.
(iv) Write the functions of parts 5 and 6
(v) How does the arrangement of neurons in the spinal cord differ from that of the brain?
The number of Spinal nerves in a human being are :
(A) 31 pairs
(B) 10 pairs
(C) 21 pairs
(D) 30 pairs
Define the term Neuron.
Differentiate between following pair with reference to the aspect in bracket.
Sensory nerve and motor nerve (direction of impulse carried)
what do we refer to in the nervous system when we say:
sensory, motors and association ……………….
‘A’ is a cylindrical structure that begins from the lower end of the medulla and extends downwards. It is enclosed in bony cage ‘B’ and covered by membranes ‘C’. As many as ‘D’ pairs of nerves arise from the structure ‘A’.
(i) What is A?
(ii) Name (a) bony cage ‘B’ and (b) membranes ‘C’
(iii) How much is D?
Write one word for the following:
wave of electrical disturbance that sweeps over the nerve cell.
Define the following term:
Nerve
Distinguish between the following pair:
Nerve impulse and flow of electricity (transmission and speed)
