Which bodily process involves inhalation and exhalation?

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

Answer: (C)

Breathing is the body's process of moving air into and out of the lungs, which includes inhalation and exhalation. This mechanical action is driven by the diaphragm and chest muscles, drawing air in during inspiration and releasing it during expiration. While ventilation also refers to air movement in and out, and respiration can describe either the gas exchange process or cellular energy use, the question’s focus is on the actual act of taking air in and letting it out, which is exactly what breathing describes. Oxygenation refers to delivering oxygen to the blood and tissues, a result of proper ventilation and gas exchange rather than the act of inhaling and exhaling itself.