Myofibrils run in parallel fashion and extend the entire length of the:
Correct answer: C. Muscle fibre or muscle cell
- A. Muscle bundle
- B. Tendon
- C. Muscle fibre or muscle cell
- D. Myofilament
Explanation
Option B is correct.Myofibrils are long, cylindrical structures that run parallel to each other in the muscle fiber. They are the contractile units of muscle fibers. The myofibrils extend the entire length of the muscle fiber. Myofibrils are made up of two types of protein filaments: thick filaments and thin filaments. The thick filaments are made up of the protein myosin, and the thin filaments are made up of the protein actin. The thick and thin filaments are arranged in repeating units called sarcomeres. Sarcomeres are the smallest contractile units of muscle fibers.
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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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The sarcoplasm of muscle fibers differs from the cytoplasm of the other cells as it contains usually:
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