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The iliotibial band, commonly called an IT band, is a fibrous tissue that rounds down the lateral side of the thigh from the hip to the knee. The purpose of the iliotibial band is to provide support for the knee and allow for greater stability during movements such as running or walking.he IT band is most active during movements that straighten the knee joint. Ad. Although the IT band is sometimes considered to be a muscle, itâs actually just a band of tissue and hence cannot be stretched in the same way that muscles can.
The M-band proteins myomesin as well as C-protein crosslink the thick filament system (myosins) and the M-band part of titin (the elastic filaments). The interaction between actin and myosin filaments in the A-band of the sarcomere is responsible for the muscle contraction (sliding filament model). [edit] Contraction Main article: Muscle contraction Upon muscle contraction, the A-bands do not change their length (1.85 micrometer in mammalian skeletal muscle) whereas the I-bands and the H-zone shorten. The protein tropomyosin covers the myosin binding sites of the actin molecules in the muscle cell.