The light band of sarcomere is called:
Correct answer: C. I band
- A. H band
- B. A band
- C. I band
- D. M band
Explanation
Option C is correct.The light band of a sarcomere is called the I band. It is made up of thin filaments, which are made up of the protein actin. The I band is dark because the thin filaments are not as densely packed as the thick filaments in the A band. The I band is important for muscle contraction. When a muscle contracts, the thick and thin filaments slide over each other. This causes the Z discs, which are located at the ends of the I band, to come closer together. This shortens the sarcomere and causes the muscle to contract. The I band also helps to anchor the thin filaments. The thin filaments are attached to the Z discs at one end and to the M line at the other end. The M line is a protein structure that runs down the center of the A band.
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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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