Skeletal Muscle | Ultrastructure Of Myofilament | Class 12 Biology Urdu Hindi

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About This Video ........................
In This Video Lecture You Will Learn Basic Concept Of Skeletal Muscle
The muscles that are attached to the skeleton and are associated with the movement of bones are
muscle ibres or cells. Each muscle ibre is a long cylindrical cell with multiple oval nuclei arranged
stores oxygen.
attached to bone by a bundle of collagen, non-elastic ibres, known as tendons.
along the length of each myoibril. Each dark band is called A band, because it is anisotropic, i.e it
alternate light and dark bands, e.g., triceps and biceps. Generally, each end of the entire muscle is
ibrils are enclosed by the muscle cell membrane or sarcolemma. The myoibrils consist of smaller
called skeletal muscles. The skeletal muscles are consciously controlled and therefore, are called
amount of stored glycogen and unique oxygen bonding protein myoglobin, a red pigment that
just beneath its sarcolemma. Skeletal muscle ibres are huge cells. Their diameter is 10 - 100 mm.
as a whole its striped appearance. Each A band has a lighter stripe in its mid section called H - zone
contractile units called sarcomere. In each sarcomere a series of dark and light band are evident
have mid line called Z - line (Z for zwishen means between).
voluntary muscles. Skeletal muscles are also called striped or striated muscles because they show
When viewed in high magniication, each muscle ibre is seen to contain a large number of myoibrils
A sarcomere is the region of a myoibril between two successive Z - lines and is the smallest
Skeletal Muscle Fibre : Each muscle consists of muscle bundles, which are further composed of
1-2 mm in diameter that run in parallel fashion and extend entire length of the cell. Bundles of these
can polarize visible light. The light band called I band is isotropic or non-polarizing. It gives the cell
Sarcoplasm of the muscle ibre is similar to the cytoplasm of other cells but it contains usually large
(H stands for “hele” mean bright). The H-zone is bisected by dark line called M - line. The I bands
contractile unit of muscle ibre. The myoibrils contain myoilaments.
Infrastructure of Myoilament :Myoilament is made up of thick and thin ilaments. The
another binds to tropomyosin while third binds calcium ions. Each myosin ilament is surrounded
I-band and partly into A band.
Thin ilaments are 7 - 8 nm thick and are composed chiely of actin molecule. The actin molecules
Twisting around the actin chains are two strands of another protein, tropomyosin. The other major
has a tail terminating in two globular heads. Myosin tail consists of two long polypeptide chains
are arranged in two chain which twist around each other like a twisted double strand of pearls.
thin myoilaments together during contraction (Fig. 16.8).
central thick ilaments extend the entire length of the A-band. The thin ilaments extend across the
The thick ilament which is about 16 nm in diameter is composed of myosin. Each myosin molecule
coiled together. The heads are sometimes called cross bridges because they link the thick and the
protein in thin ilament is troponin. It is actually three polypeptide complex, one binds to actin,
by six actin ilaments on each end.
About This Channel.....................
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Muscle bundle is covered by perimysium and entire muscle is covered by epimysium...

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Kya Sarcomere hi Myofibrils hain
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How many tail fiber present in myosin

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