Which system uses the lungs to exchange gases with the air?

Which system uses the lungs to exchange gases with the air?

• A. Respiratory System
• B. Circulatory System
• C. Nervous System
• D. Digestive System

Answer: (A)

Gas exchange with the air happens in the lungs as part of breathing. The respiratory system brings in air and, in the lungs’ tiny air sacs called alveoli, oxygen passes into the blood while carbon dioxide moves out to be exhaled. This system is specialized for exchanging gases between the air and the bloodstream, keeping body cells supplied with oxygen and ready to remove carbon dioxide. The circulatory system, while it moves gases around in the blood, doesn’t exchange gases with the air directly. The nervous system helps regulate breathing but isn’t where the gas swap with the air occurs. The digestive system handles breaking down food and isn’t involved in gas exchange with the air.

Gas exchange with the air happens in the lungs as part of breathing. The respiratory system brings in air and, in the lungs’ tiny air sacs called alveoli, oxygen passes into the blood while carbon dioxide moves out to be exhaled. This system is specialized for exchanging gases between the air and the bloodstream, keeping body cells supplied with oxygen and ready to remove carbon dioxide. The circulatory system, while it moves gases around in the blood, doesn’t exchange gases with the air directly. The nervous system helps regulate breathing but isn’t where the gas swap with the air occurs. The digestive system handles breaking down food and isn’t involved in gas exchange with the air.