Answer;
It changes to ADP
When ATP binds to the protein myosin it changes to ADP.
Step-by-step explanation;
-ATP is an important molecules in muscle contraction without which the muscle would become rigid and fail to move.
-Proteins Myosin and actin are important in muscle contraction and relaxation. Myosin protein has two binding sites; one that binds actin protein and ATP molecules binds. At this site where ATP binds, enzymatic activity hydrolyzes ATP to ADP, releasing an inorganic phosphate molecule and energy.