Define sliding filament theory of muscle contraction.
The sliding filament concept explains the technique of muscle contraction at some stage in which the skinny filaments slide over the thick filaments, which shortens the myofibril. Each muscle fibre has an exchange mild and darkish band, which incorporates a unique contractile protein, referred to as actin and myosin respectively. Actin is a skinny contractile protein gift withinside the mild band and is referred to as the I-band, whereas myosin is a thick contractile protein gift withinside the darkish band and is called the A-band. There is an elastic fibre referred to as z line that bisects every I-band. The skinny filament is firmly anchored to the z line. The relevant a part of the thick filament that isn't always overlapped through the skinny filament is called the H-region. During muscle contraction, the myosin heads or move bridges are available in near touch with the skinny filaments. As a result, the skinny filaments are pulled in the direction of the center of the sarcomere. The Z line connected to the actin filaments is additionally pulled main to the shortening of the sarcomere. Hence, the duration of the band stays consistent as its original duration and the I-band shortens and the H-area disappears.
