Answer:
ATP.
Step-by-step explanation:
ATP molecules are sent from cell A to cell B in order for the muscle to move because muscle movement requires energy. Beside ATP, NADH, FADH2, and creatine phosphate are the molecules that are needed for the movement of muscles. The ATP molecules is broken down into ADP + phosphate ion in which phosphate ion is used as energy to move muscles of the body so we can say that cell A send ATP molecules to cell B.