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How do muscles move at… (Class 10 Science SQP 2026-27, Q13)

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ScienceCBSE Class 10 · Sample paper, session 2026-27 · 3 marks · Short answer

CBSE Class 10 Science sample paper 2026-27: question 13

From the official CBSE sample question paper for 2026-27, section A, question 13, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q13 · 3 marks · Short answerControl and Coordination

How do muscles move at the cellular level and respond when processed messages are received from the brain?

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2026-27.

Hints

Open one hint at a time and try again before the next.

Hint 1

What happens to the length of a muscle cell when it contracts?

Hint 2

Which molecules inside muscle cells rearrange themselves when an impulse arrives?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. When a nerve impulse from the brain reaches a muscle, the muscle cells move by changing their shape so that they shorten (contract).

    1 mark

  2. Muscle cells contain special proteins that change both their shape and their arrangement in the cell in response to the electrical nerve impulse.

    1 mark

  3. The new arrangement of these proteins gives the muscle cells a shorter form, and this shortening produces movement.

    1 mark

Answer: On receiving a nerve impulse, special proteins in muscle cells change their shape and arrangement, making the cells shorter (contract), which causes movement.

Where the marks are

  • Muscle cells shorten/change shape when an impulse arrives (1 mark)
  • Special proteins change shape and arrangement in response to impulses (1 mark)
  • The new arrangement gives a shorter form, producing movement (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Control and Coordination, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2026-27: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.