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Locomotion and Movement — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYLocomotion and Movement5 Marks
Question
Describe the structure of a sarcomere.
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Answer

Sarcomere:
  1. Each myofibril of a muscle fibril has alternate dark and light bands throughout their length, which give the striated appearance of the muscle.
  2. The light bands contain thin actin filaments and are called I (isotropic) bands.
  3. The dark bands contain thick myosin filaments and are called A (anisotropic) bands.
  4. In the centre of the I-band is an elastic fibre, called 'Z' line, to which the actin filaments are attained firmly.
  5. The thick filaments are held together by a thin fibrous membrane, called 'M' line, in the middle of the A band.
  6. In the resting stage, the edges of the thin filaments partially overlap the free ends of the thick filaments.
  7. The central portion of the A band that is not overlapped by the thin filaments, is called H-zone.
  8. The part of the myofibril between two 'Z' lines is a sarcomere.

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