If the skeletal muscle fibres are soaked and treated with high concentration of salts, large quantities of proteins are removed. The fibres can no longer contract and the A-bands disappear. This shows that

Myosin is essential for contraction of the fibres

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Actin is essential for contraction

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Both myosin and actin are essential for contraction

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Proteins do not play any role in the contraction of fibres

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Solution

The correct option is C Both myosin and actin are essential for contraction
The muscle fibre is composed of many myofibrils, which consist of thick and thin filaments (myofilaments). The special arrangement of these and the bands of myofibrils give the fibre a striated appearance under a microscope. The filaments consist almost entirely of the myofibular proteins actin (thin 20 to 25 percent) and myosin (thick 5055 percent). They are mainly responsible for the muscles ability to retain water and bind added water (water-holding capacity).
Therefore, the correct answer is option C.

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Similar questions

upon contraction of sarcomere in skeletal muscle fibres , reduction is not observed in?

1. length of actin filaments

2. size of region enclosed by 2 z lines

3. h zone

4. i band

Asserion(A): At cellular level, muscle fibres contract and show appropriate response on receiving impulses.

Reason(R): Muscle fibres contract because of change of structure of muscle proteins at cellular level.

Which ion is essential for muscle contraction?

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