what is the function of the respiratory system

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The respiratory system provides the body with oxygen and removes the waste gas carbon dioxide as well as water vapor. The nose warms and moistens the air as well as filters dust and particles so that they don't travel farther towards the lungs. The air travels to the trachea or windpipe and to the bronchi. These in turn branch into smaller and smaller tubes in the lungs called bronchial tubes. Eventually, they become the smallest tubes--bronchioles. These end in alveoli, thin and moist air sacs which are in close contact with the capillaries that surround them. An exchange takes place--oxygen is absorbed into the capillaries and carbon dioxide leaves the bloodstream, enters the alveoli and will eventually be exhaled. Oxygen is needed for cellular respiration to take place. Oxygen is transported by hemoglobin a red pigment in the blood and is carried to all cells of the body.

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