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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More Support and Movement questions
Thin filaments have a diameter of:
Globular heads of myosin filaments link the thick and the thin myofilaments together during contraction, which is why they are sometimes called:
Each myosin molecule has a tail terminating in:
During muscle contraction, the cross-bridges of thick filaments become attached to:
Calcium ions bind with the troponin molecule and cause them to:
Once the myosin head has become attached to the actin filament: