Thin filaments are composed chiefly of:
Correct answer: A. Actin
- A. Actin
- B. Troponin
- C. Tropomyosin
- D. Myosin
Explanation
Option A is correct.Thin filaments are composed chiefly of actin. Actin is a protein that makes up the thin filaments of muscle cells. The thin filaments are arranged in a double helix along the center of the sarcomere. Actin is a long, thin protein that is made up of two strands that twist around each other. The actin filaments are attached to the Z discs, which are located at the ends of the sarcomere.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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