CBSE Class 10 Science 2020 · Paper 31/4/1 · Question 18
A cheetah, on seeing a prey, moves towards him at a very high speed. What causes the movement of his muscles ? How does the chemistry of cellular components of muscles change during this event ?
Answer
Nerve impulses from the brain make muscle cells shorten; their special proteins change shape and arrangement, giving a shorter form so the muscles contract.
Cause of the movement: on seeing the prey, nerve impulses are generated. The brain sends electrical impulses through the nerves to the muscles, and the muscle fibres move: the muscle cells change their shape so that they shorten.
Change in the muscle cells: muscle cells have special proteins that change both their shape and their arrangement in the cell in response to the nervous electrical impulses. The new arrangement of these proteins gives the muscle cells a shorter form, so the muscles contract and the cheetah moves.
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