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Question

Read the statements carefully and comment on them.

A. A bands of muscle fibre are dark and contain myosin.

B. I bands of muscle fibre are light and contain actin.

C. During muscle contraction, the A bands contract.

D. The part between two Z lines is called sarcomere.

E. The central part of the thin filament not overlapped by the thick filament is the H zone.


  1. A, C and E are correct, while B and D are incorrect.

  2. A and B are correct, while C, D and E are incorrect.

  3. A, B and C are correct, while D and E are incorrect.

  4. A, B and D are correct, while C and E are incorrect.


Solution

The correct option is D

A, B and D are correct, while C and E are incorrect.


A bands of muscle fibre are dark and contain myosin. I bands of muscle fibre are light and contain actin. The part between two successive Z lines is called a sarcomere. During muscle contraction, the I bands contract. The central part of a thin filament not overlapped by a thick filament is the Z line.

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