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  4. The thin filaments of a muscle fibre are made up of :

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Q. The thin filaments of a muscle fibre are made up of :

Haryana PMTHaryana PMT 2005

Solution:

The thin filaments of a muscle fibre are made up of actin, troponin and tropomyosin. One thin filament probably contains $300-400$ actin molecules, about $50$ tropomyosin and $50$ troponin. It is said that tropomyosin plays a vital role in sensitizing the contractile proteins (actin and myosin) to calcium ions.