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What is the purpose of the "Z" line in a myofibril?

Options

  1. ATo contract the sarcomere
  2. BTo hold the thick filaments together
  3. CTo separate the sarcomeres
  4. DTo regulate the overlap of thin filaments on thick filaments

Correct answer

C. To separate the sarcomeres

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 filaments In a resting state, the edges of thin filamen

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