It is made up of thick and thin filament:
Correct answer: A. Myofibril
- A. Myofibril
- B. Muscle fibre
- C. Muscle bundle
- D. Myoglobin
Explanation
Option A is correct. Myofibrils are the contractile units of muscle fibers. They are made up of repeating units called sarcomeres. Sarcomeres contain thick and thin filaments. Thick filaments are made up of the protein myosin, while thin filaments are made up of the protein actin. Myosin is a long, rod-shaped protein, while actin is a long, thin protein. The thick and thin filaments are arranged in a specific way within the sarcomere. The thick filaments are located in the center of the sarcomere, while the thin filaments are attached to the Z discs, which are located at the ends of the I band.
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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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