Question

what is the overall reason for cellular respiration? why do we do it?

Explanation:

Cellular respiration is a process in cells (like in humans, plants, etc.) that breaks down glucose (or other organic molecules) using oxygen (in aerobic respiration) to produce ATP (adenosine triphosphate), which is the energy currency of cells. Organisms perform cellular respiration to generate ATP, which is used to power various cellular activities like muscle contraction, active transport, synthesis of molecules (like proteins, DNA), and maintaining cellular functions. Without ATP from cellular respiration, cells can't carry out essential life - sustaining processes.

Answer:

The overall reason for cellular respiration is to convert the chemical energy stored in organic molecules (e.g., glucose) into ATP (adenosine triphosphate), which is the usable form of energy for cells. We (and all organisms that perform cellular respiration) do it because ATP provides the energy needed to power essential cellular processes such as muscle contraction, active transport across cell membranes, synthesis of biomolecules (like proteins, nucleic acids), and maintenance of cellular structures and functions.