skeletal Muscle tissue

 Muscle tissue is classified into three types according to structure and function: skeletal, cardiac, and smooth 

skeletal :Long cylindrical fiber, striated, many peripherally located nuclei Voluntary movement, produces heat, protects organsLocation=> Attached to bones and around entrance points to body  (e.g., mouth, anus)

Cardiac muscle Short, branched, striated, single central nucleus Contracts to pump blood- location=> Heart

Smooth Short, spindle-shaped, no evident striation, single nucleus in each fiber Involuntary movement, moves food, involuntary control of respiration, moves secretions, regulates flow of blood in arteries by contraction-location : Walls of major organs and passageways 

Skeletal muscle is attached to bones and its contraction makes possible locomotion, facial expressions, posture, and other voluntary movements of the body.

Forty percent of your body mass is made up of skeletal muscle. Skeletal muscles generate heat as a byproduct of their contraction and thus participate in thermal homeostasis.

Shivering is an involuntary contraction of skeletal muscles in response to perceived lower than normal body temperature. The muscle cell, or myocyte, develops from myoblasts derived from the mesoderm. Myocytes and their numbers remain relatively constant throughout life. Skeletal muscle tissue is arranged in bundles surrounded by connective tissue.

Under the light microscope, muscle cells appear striated with many nuclei squeezed along the membranes. The striation is due to the regular alternation of the contractile proteins actin and myosin, along with the structural proteins that couple the contractile proteins to connective tissues.The cells are multinucleated as a result of the fusion of the many myoblasts that fuse to form each long muscle fiber.