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How are thick and thin filaments arranged in a muscle fibre?

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(i) Myofibril are arranged in sacromeres. The sarcomere is the zone between two Z lines. A-band is present in centre of sarcomere, near to it is I-band. 

(ii) The skeletal muscle has alternate A and I bands. 

(iii) These are called anisotropic (dark) and isotropic (light) bands. Z-line lies in centre of Iband but middle of A band is H-zone. 

(iv) Sarcoplasm has many thick and thin filaments. H-zone has only thick filaments but I band contains thin filaments. 

(v) The remaining part of A band has both thin (actin) and thick (myosin) filaments. 

(vi) The thin filaments have actin protein but thick are made of myosin.

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