Q. Which of the following statements is true ?

• A. Carbon monoxide diffuses from lungs into blood and oxygen diffuses from blood into lungs
• B. Carbon dioxide diffuses from lungs into blood and oxygen diffuses from blood into lungs
• C. Oxygen diffuses from lungs into blood and carbon dioxide diffuses from blood into lungs
• D. Oxygen diffuses from lungs into blood and carbon monoxide diffuses from blood into lungs

Correct Answer: D