Here's why:
* Cellular Respiration's Goal: The main goal of cellular respiration is to break down glucose (a sugar) and extract the chemical energy stored within its bonds.
* ATP: The Energy Currency: ATP is the primary energy currency used by cells to power various processes, such as muscle contraction, protein synthesis, and active transport.
* The Process: During cellular respiration, glucose is broken down in a series of steps, with energy released at each stage. This released energy is used to add a phosphate group to ADP (adenosine diphosphate), converting it to ATP.
Therefore, cellular respiration essentially converts the chemical energy stored in glucose into a usable form of energy for the cell, which is ATP.