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Date May 2018 Marks available 1 Reference code 18M.1.HL.TZ2.38
Level Higher level Paper Paper 1 Time zone Time zone 2
Command term Question number 38 Adapted from N/A

Question

The diagram shows two states of skeletal muscle, relaxed and contracted.

[Source: Provophys/Wikipedia. File licensed under CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0/)]

Which process is part of muscle contraction?

A. Myosin filaments cause the actin filaments to shorten.

B. Ca2+ from the sarcoplasmic reticulum binds to the myosin heads.

C. ATP provides energy for the movement of the myosin heads.

D. Ca2+ binds to tropomyosin and uncovers troponin.

Markscheme

C

Examiners report

[N/A]

Syllabus sections

Additional higher level » Topic 11: Animal physiology » 11.2 Movement
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Additional higher level » Topic 11: Animal physiology
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