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What is the relationship between the thin filaments and thick filaments in a resting state myofibril?

Options

  1. AThe thin filaments completely overlap the thick filaments
  2. BThe thin filaments do not overlap the thick filaments
  3. CThe thin filaments partially overlap the free ends of the thick filaments
  4. DThe thin filaments completely separate the thick filaments

Correct answer

C. The thin filaments partially overlap the free ends of the thick filaments

Step-by-step solution

The portion of the myofibril between two successive "Z" lines is considered as the functional unit of contraction and is called a sarcomere. The striated appearance of myofibrils is due to the distribution pattern of two important proteins - Actin and Myosin. The light bands contain actin and the dark bands contain myosin.The light bands in a myofibril contain actin and is called I-band or Isotropic bandThe actin filaments are thinner as compared to the myosin filamentsIn a resting state, the edges of thin filament

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