Locomotion and Movement · NEET Preparation Zoology
Which change occurs in a sarcomere during contraction of a skeletal muscle fibre?
Practice question from Locomotion and Movement (NEET Preparation Zoology), with the correct answer and a step-by-step solution.
easy · MCQ · Q-3EE73C
Which change occurs in a sarcomere during contraction of a skeletal muscle fibre?
- A.The actin filaments shorten, while the myosin filaments remain unchanged.
- B.The A band decreases in length, while the I band remains unchanged.
- C.The I band and H zone decrease in width, while the A band remains unchanged.Correct answer
- D.The A band, I band and H zone all decrease in width.
Solution
During contraction, thin actin filaments slide towards the centre of the sarcomere without changing length. Therefore, the I band and H zone become smaller, whereas the A band remains constant.
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