What is the primary function of the respiratory system?

What is the primary function of the respiratory system?

• A. Oxygenating blood cells
• B. Pumping blood
• C. Filtering toxins
• D. Producing hormones

Answer: (A)

Gas exchange is the primary function of the respiratory system. Inhaled air reaches the alveoli, where oxygen diffuses into the capillaries and binds to hemoglobin in red blood cells, allowing oxygen to be carried through the bloodstream to tissues that need it. At the same time, carbon dioxide—a waste product of metabolism—diffuses from the blood into the alveoli to be exhaled. This oxygen delivery and CO2 removal keep cells energized and maintain pH balance. Pumping blood is the job of the heart and circulatory system; filtering toxins is mainly handled by the liver and kidneys (with the lungs also helping remove particulates, not as their primary role); producing hormones belongs to the endocrine system.

Gas exchange is the primary function of the respiratory system. Inhaled air reaches the alveoli, where oxygen diffuses into the capillaries and binds to hemoglobin in red blood cells, allowing oxygen to be carried through the bloodstream to tissues that need it. At the same time, carbon dioxide—a waste product of metabolism—diffuses from the blood into the alveoli to be exhaled. This oxygen delivery and CO2 removal keep cells energized and maintain pH balance.

Pumping blood is the job of the heart and circulatory system; filtering toxins is mainly handled by the liver and kidneys (with the lungs also helping remove particulates, not as their primary role); producing hormones belongs to the endocrine system.