Which one of the following is correct regarding A-band?
Correct answer: D. Myosin acts as a polarizer of light
- A. It is non-polarizing
- B. It contains only actin
- C. It is isotropic
- D. Myosin acts as a polarizer of light
Explanation
Each dark band in the skeletal muscles is called A-band because it is anisotropic i.e it can polarize visible light. This polarization of light is due the presence of myosin. It also contains overlapping actin.
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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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