What is the function of the respiratory system?

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Multiple Choice

What is the function of the respiratory system?

Gas exchange is the main function being tested. The respiratory system brings in air and exchanges gases in the lungs: oxygen moves from the air into the blood in the alveolar capillaries, binding to hemoglobin and oxygenating the blood, while carbon dioxide moves from the blood into the air to be exhaled. This oxygenation and CO2 removal is the core job of respiration. The other options describe roles of other body systems—filtering blood is done by the kidneys, regulating hormones by the endocrine system, and producing enzymes by digestive or other glands—so they aren’t functions of the respiratory system.

Gas exchange is the main function being tested. The respiratory system brings in air and exchanges gases in the lungs: oxygen moves from the air into the blood in the alveolar capillaries, binding to hemoglobin and oxygenating the blood, while carbon dioxide moves from the blood into the air to be exhaled. This oxygenation and CO2 removal is the core job of respiration. The other options describe roles of other body systems—filtering blood is done by the kidneys, regulating hormones by the endocrine system, and producing enzymes by digestive or other glands—so they aren’t functions of the respiratory system.

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