MICROANATOMY

Detailed explanation-1: -M line: M line contains the protein called myomesin and it marks the centre of the sarcomere. H zone: it is the area between the M line and Z disc and this zone contains only the myosin.

Detailed explanation-2: -M line-marks the middle of the sarcomere and contains the protein called myomesin. H zone-is the area between the M line and Z disc. The H zone contains only myosin.

Detailed explanation-3: -The M-line runs down the center of the sarcomere, through the middle of the myosin filaments. The I-band is the region containing only thin filaments. The H-zone contains only thick filaments. The A-band contains both thick and thin filaments and is the center of the sarcomere that spans the H zone.

Detailed explanation-4: -The M-band is the transverse structure in the center of the sarcomeric A-band, which is responsible both for the regular packing of thick filaments and for the uniform distribution of the tension over the myosin filament lattice in the activated sarcomere.

Detailed explanation-5: -M line. Definition: In striated muscle sarcomere, the M line is the attachment site for the thick filaments. The M line is in the center of the A band and, thus, it is in the center of the sarcomere.