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NEETZoologyLocomotion and Movement

Based on the diagram shown, match the following: Column A Column B Z-line a) region in middle of A-band M-line b) region not overlapped by thin filaments Sarcomere c) Elastic fibre that bisects I-band. H-zone d) portion between two successive Z-line

Options

  1. AI (c), II (a), III (b), IV (d)
  2. BI (a), II (c), III (b), IV (d)
  3. CI (a), II (a), III (c), IV (b)
  4. DI (c), II (a), III (d), IV (b)

Correct answer

D. I (c), II (a), III (d), IV (b)

Step-by-step solution

Each myofibril has alternate dark and light bands on it. A detailed study of the myofibril has established that the striated appearance is due to the distribution pattern of two important proteins – Actin and Myosin. The light bands contain actin and is called I-band or Isotropic band, whereas the dark band called ‘A’ or Anisotropic band contains myosin. Both the proteins are arranged as rod-like structures, parallel to each other and also to the longitudinal axis of the myofibrils. Actin filaments are thinner as c

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