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Question

Describe the structure of actin and myosin filaments.
(The Length Sarcomere is 2.5μm(.Actin rod =1μm,) myosin=1.5μm 1Myosin filament & 1 Actin filament is surrounded by 3 Myosin filament.)

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Solution

In the muscle cells, myosin and actin are the major components. The muscle cells are always elongated slender and spindle-shaped fibre like cells they are therefore also known as muscle fibres.
This poses a large number of myofibrils which are formed of actin and myosin. In the striated muscles, this shows a transverse striation in the form of regular alternate dark anisotropic bands and light isotropic bands. The anisotropic band contains thick myosin filaments and isotropic band contains thin actin filament.
I band is divided into two equal parts by a thin fibrous transverse zig-zag partition which is known as Z band.
The space between two filaments forms a sarcomere.

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