Sarcoplasm is present in certain muscle fibres that have a large number of mitrochondria, which can be thought of as energy-producing units in a cell. The mitochondria produce large quantities of the chemical adenosine triphosphate, commonly referred to as ATP.
According to IvyRose Holistic, cellular activities associated with ATP include the contracting of muscles and the moving of chromosomes during the process of cell division. In addition, ATP moves structures within cells; moves chromosomes during cell division; transports substances across a cell membrane; and synthesizes large molecules into smaller ones. ATP is necessary for muscle contractions and is produced by mitrochondria found in the muscle cells.