Question

¤ Explain the mechanism or Muscles Contraction .

OR

¤ Explain the Sliding Filament Theory in Briefly.

[▪▪ Writes all the steps to explain above Topics with give a diagram.]

••• Class 11th.


☞ Asked By ☆ Ⓜr. Thakur ☆

Answer 1

hope it helps u.....
read properly my notes...

Answer 2

Hey mate ^_^

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Answer:
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=> It is the process of muscle contraction during which the thin filaments slide over the thick filaments, which shortens the myofibril.

=> Each muscle fibre has an alternate light and dark band, which contains a special contractile protein, called actin and myosin respectively.

=> Actin is a thin contractile protein present in the light band and is known as the I-band.

=> Whereas myosin is a thick contractile protein present in the dark band and is known as the A-band.

=> There is an elastic fibre called z line that bisects each I-band.

=> The thin filament is firmly anchored to the z line.

=> The central part of the thick filament that is not overlapped by the thin filament is known as the H-zone.

=> During muscle contraction, the myosin heads or cross bridges come in close contact with the thin filaments.

=> The thin filaments are pulled towards the middle of the sarcomere.

=> The Z line attached to the actin filaments is also pulled leading to the shortening of the sarcomere.

=> The length of the band remains constant as its original length.

=> And the I-band shortens and the H-zone disappears.

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