Answer:
Exhaling is releasing the build-up of carbon dioxide which is a byproduct of your Mitochondria producing energy.
Step-by-step explanation:
Glucose plus oxygen produces carbon dioxide, water, and energy. When this process stops, the cell dies. The food and drink we eat can be broken into carbon compounds, one of the most simple being glucose (C6H12O6). When that reacts with oxygen (O2) in the cells, it produces carbon dioxide (CO2) and water (H2O).