MICROANATOMY

Detailed explanation-1: -These changes are explained by the actin and myosin filaments sliding past one another, so that the actin filaments move into the A band and H zone. Muscle contraction thus results from an interaction between the actin and myosin filaments that generates their movement relative to one another.

Detailed explanation-2: -When a sarcomere contracts, myosin heads attach to actin to form cross-bridges. Then, the thin filaments slide over the thick filaments as the heads pull the actin. This results in sarcomere shortening, creating the tension of the muscle contraction.

Detailed explanation-3: -In muscle contraction, the actin filaments slide along the myosin filaments. This is driven by the heads of the myosin molecules, which bind to actin and, in a sequence of binding and release movements, ‘walk’ along the actin filament.

Detailed explanation-4: -Control of Muscle Tension Neural control initiates the formation of actin–myosin cross-bridges, leading to the sarcomere shortening involved in muscle contraction. These contractions extend from the muscle fiber through connective tissue to pull on bones, causing skeletal movement.