In a normal respiratory system with average amounts of blood/blood pressure, the lungs function as oxygen intake centers for the body, as well as excretion of wastes, such as carbon dioxide. Without this constant cycle of intake and expulsion, humans would have a buildup of leftovers that form during the conversion of the nourishment we take in. The lungs do this by readily changing their volume to either force air from the environment in or out through the mouth. The oxygen within the air is then exchanged within the most miniscule parts of the lung, known as alveoli, via the hemoglobin within the red blood cells. Carbon dioxide is then put in its place, allowing blood cells to constantly perform this process and supply the body with the oxygen it need. This monitoring of the carbon dioxide levels within the blood also helps to control blood pH, which has a number of implications within the metabolic activities of other organs and tissues.
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