Adenosine Triphosphatase (ATPase): An enzyme in skeletal
muscle that catalyzes the hydrolysis of adenosine triphosphate to
adenosine diphosphate and inorganic phosphate. Among various
enzymes in this group associated with cell membranes and
intracellular structures, mitochondrial ATPase is involved in
obtaining energy for cellular metabolism, and myosin ATPase is
involved in muscle contraction.