Why cross bridge formation in sliding filament theory is known as cross bridge formation?
Dear student,
Cross bridge formation occurs in sliding filament theory for the contraction of muscles. During muscle contraction, the myosin heads or cross bridges come in close contact with the thin filaments. As a result, the thin filaments are pulled towards the middle of the sarcomere. The Z line attached to the actin filaments is also pulled leading to the shortening of the sarcomere. Hence, the length of the band remains constant as its original length and the I-band shortens and the H-zone disappears. So, myosin forms cross bridge with the actin filaments and pulls it, therefore cross bridge is formed in muscle contraction.
Regards
Cross bridge formation occurs in sliding filament theory for the contraction of muscles. During muscle contraction, the myosin heads or cross bridges come in close contact with the thin filaments. As a result, the thin filaments are pulled towards the middle of the sarcomere. The Z line attached to the actin filaments is also pulled leading to the shortening of the sarcomere. Hence, the length of the band remains constant as its original length and the I-band shortens and the H-zone disappears. So, myosin forms cross bridge with the actin filaments and pulls it, therefore cross bridge is formed in muscle contraction.
Regards