Oxygenation is defined as which?

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

Answer: (B)

Oxygenation is the process of getting oxygen into the blood from the lungs. Oxygen moves from the alveoli into the pulmonary capillaries and binds to hemoglobin, increasing the amount of oxygen carried in arterial blood. This oxygen-rich blood is then available to nourish body tissues. Ventilation, by contrast, is simply the movement of air in and out of the lungs and is a prerequisite for oxygenation but not the definition itself. Perfusion refers to blood flow through the lungs and tissues, which supplies the blood that can be oxygenated. Respiration can mean gas exchange at the tissue level or cellular use of oxygen, but it does not specifically describe the blood’s oxygen content. So the term defined here is the loading of oxygen into the blood.