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NEETZoologyLocomotion and Movement

Choose the incorrect statement based on the diagram shown.

Options

  1. AEach myofibril contains many serially arranged units called sarcomere which are the functional units.
  2. BEach sarcomere has a central ‘A’ band made of thick myosin filaments, and two half ‘I’ bands made of thin acti
  3. CActin and myosin are polymerised proteins with excitability.
  4. DMuscle fibre is the anatomical unit of muscle.

Correct answer

C. Actin and myosin are polymerised proteins with excitability.

Step-by-step solution

Trick: The lines are taken from a summary which are often missed by students. Muscle fibre is the anatomical unit of muscle. Each muscle fibre has many parallelly arranged myofibrils. Each myofibril contains many serially arranged units called sarcomere which are the functional units. Each sarcomere has a central 'A' band made of thick myosin filaments, and two half 'I' bands made of thin actin filaments on either side of it marked by 'Z' lines. Actin and myosin are polymerised proteins with contractility.

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