Draw diagram of pectoral girdle, bones of fore limb, pelvic girdle and bones of hind limb of man.


Draw diagram of pectoral girdle, bones of fore limb, pelvic girdle and bones of hind limb of man.
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Describe the structure of actin filament.


Action filament :

1. Each actin (thin) filament is made of two “F” (filamentous) actins helically wound to each other. Each ‘F’ actin is a polymer of monomelic ‘G’ (Globular) actins.

2. Two filaments of another protein, tropomyosin also run close to the ‘F’ actins throughout its length.

3. A complex protein troponin is distributed at regular intervals on the tropomyosin.

Describe the structure of actin filament.

Structure of thick and thin filaments

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Distinguish between : (a) A-band and I-band

(a) A-band

I-band

1.Anisotropic band

Isotropic band.

2. Dark in appearance and hence also called dark band.

Light in appearance and hence called light band.

3. It contains myosin.

It contains actin . 

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