Muscles are composed of _.
Correct answer: C. Groups of cell fibers
- A. Silica
- B. Polyester threads
- C. Groups of cell fibers
- D. Calcium and Phosphorus
Explanation
Option C is correct since muscles are composed of 'muscle fibers' which are further composed of 'myofibrils' which are composed of 'sarcomeres' linked in series. A sarcomere is a functional unit between two consecutive Z-lines.
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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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