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NEETZoologyLocomotion and Movement

Skeletal Muscle Component Description A. Sarcomere 1. Basic functional unit of muscle contraction B. Myofibril 2. Dark band in the middle of the A-band, contains only thick filaments C. Z-line 3 .Structural unit composed of actin and myosin filaments D. H-zone 4. Defines the boundary of a sarcomere

Options

  1. AA - 4, B - 2, C - 3, D - 1
  2. BA - 3, B - 1, C - 2, D - 4
  3. CA - 1, B - 3, C - 4, D - 2
  4. DA - 2, B - 4, C - 1, D - 3

Correct answer

C. A - 1, B - 3, C - 4, D - 2

Step-by-step solution

Sarcomere: The basic functional unit of muscle contraction, extending from one Z-line to the next. Myofibril: Composed of repeating units of sarcomeres, made up of actin and myosin filaments. Z-line: The boundary of a sarcomere, where actin filaments are anchored. H-zone: A region in the A-band that contains only thick filaments and appears lighter.

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