What is the primary difference between ventilation and respiration in the respiratory system?

• A. Ventilation is the exchange of air between the environment and lungs, while respiration is the exchange of gases at the cellular level.
• B. Ventilation refers to the oxygen transport in blood, and respiration is the contraction of respiratory muscles.
• C. Ventilation involves blood circulation, whereas respiration involves diaphragm movement.
• D. Ventilation is the process of gas exchange in tissues, while respiration is the movement of air in and out of the lungs.

Answer: (A)