Thin filaments of muscles contain _ chains of actin molecules.
Correct answer: A. Two
- A. Two
- B. One
- C. Three
- D. Four
Explanation
The actin molecules contain active sites, to which myosin heads will bind, during contraction. The thin filaments contain two intertwined bands of actin monomers. Alongside, they possess regulatory proteins called tropomyosin and troponin, which regulate the interaction of actin and myosin.
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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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