Which two proteins are the major components of myofibrils allowing for muscle fiber contraction?
Correct answer: D. Actin and Myosin
- A. Myosin and Cartilage
- B. Mylode and Myosin
- C. Lamellae and Actin
- D. Actin and Myosin
Explanation
Option D is correct since Myofibrils are composed of overlapping thick ( Myosin) and thin Myofilaments (Actin) organized into sarcomeres. These allow muscle fiber to contract.
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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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