Oxygen is the element essential for respiratory processes in humans. It is crucial for cellular respiration, a metabolic process where cells utilize oxygen to convert glucose into energy, producing carbon dioxide and water as byproducts. Oxygen is transported in the blood by hemoglobin in red blood cells, and its availability directly impacts energy levels and overall health. Lack of oxygen can lead to severe consequences, making it vital for sustaining life. In addition to human health, oxygen plays a significant role in various biological and ecological systems, underscoring its importance in both respiratory processes and overall well-being.