Which statement best describes the relationship between ventilation and respiration?

Which statement best describes the relationship between ventilation and respiration?

• A. Ventilation is the process of breathing; respiration is gas exchange at the cellular level.
• B. Ventilation refers to gas exchange in the alveoli, while respiration refers to moving air in and out of the lungs.
• C. Ventilation is affected by oxygen levels; respiration is affected by carbon dioxide levels.
• D. Ventilation affects removal of carbon dioxide. Respiration impacts the ability to oxygenate the blood.

Answer: (D)

Ventilation is the mechanical movement of air into and out of the lungs, which is how the body gets fresh air to the alveoli and removes the metabolic waste gas CO2. If ventilation drops, CO2 clearance suffers and CO2 builds up in the blood. Respiration refers to the gas exchange processes across the alveolar-capillary membrane (external respiration) and, at the tissues, the exchange with cells (internal respiration). The effectiveness of this gas exchange determines how well oxygen moves into the blood and how oxygenated the arterial blood becomes. So ventilation mainly governs CO2 removal, while respiration governs the oxygenation of the blood.

Ventilation is the mechanical movement of air into and out of the lungs, which is how the body gets fresh air to the alveoli and removes the metabolic waste gas CO2. If ventilation drops, CO2 clearance suffers and CO2 builds up in the blood. Respiration refers to the gas exchange processes across the alveolar-capillary membrane (external respiration) and, at the tissues, the exchange with cells (internal respiration). The effectiveness of this gas exchange determines how well oxygen moves into the blood and how oxygenated the arterial blood becomes. So ventilation mainly governs CO2 removal, while respiration governs the oxygenation of the blood.