Oxygen is the essential element for respiration in humans. During the process of cellular respiration, oxygen is utilized to convert glucose into energy, producing carbon dioxide and water as byproducts. This process occurs in the mitochondria of cells and is critical for sustaining life. Oxygen is inhaled through the lungs and transported by hemoglobin in red blood cells to various tissues and organs throughout the body. Adequate oxygen levels are necessary for cellular metabolism, and a lack of oxygen can lead to severe health complications and, ultimately, death if not addressed.