What is the process of adding oxygen to the body system called? (rephrased for exam style)

• A. Oxygenation
• B. Ventilation
• C. Perfusion
• D. Respiration

Answer: (A)

Oxygenation focuses on the actual addition of oxygen to the body's circulation. It refers to the uptake of oxygen from the lungs into the blood and its binding to hemoglobin (with some dissolved in plasma), making oxygen available to tissues. Ventilation is just the movement of air in and out of the lungs, which enables oxygen to reach the alveoli but doesn’t describe the oxygen content of the blood. Perfusion describes blood flow to tissues, which influences how well oxygenated blood reaches cells but isn’t the process of adding oxygen itself. Respiration is a broader term that can include cellular use of oxygen or gas exchange in general, but it isn’t as precise for describing the act of adding oxygen to the body. So the best term for adding oxygen to the body system is oxygenation.