The lungs are part of which body system?

• A. Respiratory system
• B. Cardiovascular system
• C. Skeletal system
• D. Nervous system

Answer: (A)

The lungs are part of the respiratory system, which is responsible for breathing and gas exchange. The lungs are the main organs where oxygen from the air enters the bloodstream and carbon dioxide is released from the blood to be exhaled. This system also includes the airways and the diaphragm that help move air in and out.

The other systems have different roles: the cardiovascular system handles the heart and blood vessels to transport blood; the skeletal system provides bones and support; the nervous system controls body activities through nerves and the brain. So the lungs belong to the respiratory system.