GENERAL HISTOLOGY

Detailed explanation-1: -This process is known as myosin-actin cycling. As the myosin S1 segment binds and releases actin, it forms what are called cross bridges, which extend from the thick myosin filaments to the thin actin filaments. The contraction of myosin’s S1 region is called the power stroke (Figure 3).

Detailed explanation-2: -Actin-myosin cross-bridge is formed when actin and myosin heads become linked together. In general, a myosin head flexes and delivers a power stroke when it binds to an actin filament. The force which is generated from the power stroke is due to the moving of the actin filament past the myosin.

Detailed explanation-3: -A distinctive structure consisting of two globular heads on each myosin molecule which interact in the presence of calcium ions with specific sites on a thin actin filament. The cross-bridges contain ATPase and generate the tension developed by a muscle fibre during a muscle action.

Detailed explanation-4: -Answer and Explanation: The correct answer: During muscle contraction, myosin cross-bridges attach to B) actin filaments. Muscle contraction is a process in which the interaction between the muscle filaments takes place.