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 Online Notes for 9th Class Science – Animal Tissue – Muscular Tissue Class 9 Science notes :  a) Striated muscle : They are called as  striped or skeletal or voluntary. The entire muscle show alternate dark and light strips and therefore called stripped muscle. They are attached to bones and are responsible for body movement, and therefore called  skeletal muscles. These muscles work according to our will, they are called as  voluntary muscles. Striated muscles fibers are long or elongated, unbranched, have many nuclei.Each muscle cell is enclosed in a thin but distinct plasma membrane called sarcolemma.These muscles are present in limbs,face,neck,tongue,pharynx,diaphragm. It helps in smooth contraction and movement. b) Smooth muscle They occur as a bundle or sheets of spindle-shaped cells.They have a single centrally located nucleus in the center of cytoplasm. Delicate, contractile thread called myofibrils run longitudinally through the cell.They are found in walls of the