Question

muscles need energy to contract. the immediate source of energy is provided by atp stored in the cells. the image shows the structure of atp. which bond in the structure of atp breaks first to release energy for the muscle cells to contract and relax? a 4 b 1 c 3 d 2

Explanation:

ATP (adenosine - triphosphate) has high - energy phosphate bonds. The outermost phosphate bond (the one farthest from the adenosine molecule) is the one that breaks first to release energy for muscle cell contraction and relaxation. In the structure shown, the bond labeled as 4 is the outermost phosphate - phosphate bond.

Answer:

D. 4