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Science · 2023 · 2 marks
CBSE 2023 · Region 6 · Set 3 · Q22
(a) How is an electric impulse created in human nervous system? Identify the parts of a neuron which helps the nerve impulse to travel (i) towards…
(a)
How is an electric impulse created in human nervous system ? Identify the parts of a neuron which helps the nerve impulse to travel
(i)
towards the cell body
(ii)
away from the cell body
OR
(b)
With the help of an example, explain how does the feedback mechanism regulate the hormone secretion.
Marking-scheme solution
(a) The information acquired at the end of a dendritic tip of a nerve cell sets off a chemical reaction that creates an electrical impulse.
(i) dendrite
(ii) axon
OR
(b) The timing and amount of hormone released are regulated by feedback mechanisms
If the sugar level in blood rise more insulin is produced.
As the blood sugar level falls, insulin secretion is reduced.
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.