Just as all of the circulatory system serves the capillaries,all of the respiratory system serves the alveoli.

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The alveoli are the site of gas exchange in the respiratory system, and all parts of the respiratory system (such as the bronchi, bronchioles and lungs) work together to bring oxygen into the alveoli and remove carbon dioxide from them. Similarly, all parts of the circulatory system work together to deliver oxygenated blood to the capillaries and remove deoxygenated blood from them. Therefore, both systems have a central function or purpose, with all parts of the system working together to support that function.

Just as All of the Circulatory System Serves the Capillaries,all