What is a characteristic of exhaled air?

Exhaled air is characterized by a higher concentration of carbon dioxide and a lower concentration of oxygen compared to the air we inhale. This is because, during the process of respiration, oxygen is absorbed by the body to produce energy, while carbon dioxide, a byproduct of this energy production, is released back into the environment during exhalation. Therefore, the composition of exhaled air reflects the metabolic processes occurring within the body, resulting in the presence of more carbon dioxide and less oxygen. This understanding is crucial in studying respiration and the exchange of gases in human physiology.