GENERAL HISTOLOGY

Detailed explanation-1: -Skeletal muscle contractions pull on the bones of the skeleton and allow those bones (and the body structures they support) to move. All three muscle types contain actin and myosin filaments, which work together to produce muscle contractions.

Detailed explanation-2: -Skeletal and cardiac muscles are known as striated muscles, because the filaments of actin and myosin that power their contraction are organized into repeating arrays, called sarcomeres, that have a striated microscopic appearance.

Detailed explanation-3: -The fundamental repeat unit within muscle that is responsible for contraction is the sarcomere. The sarcomere consists of a bundle of myosin-containing thick filaments flanked and interdigitated with bundles of actin-containing thin filaments (Fig. 1).