 Breathing and Circulation Mechanism
As the mouth and nose connect to the trachea, the trachea continues to the bronchial tubes where, in turn, we find the uncountable alveoli. With a surface area roughly equivalent to ½ of a tennis court, the alveoli capillaries are extensive. It is in the alveoli that the gas exchange of oxygen and carbon dioxide occurs. As the concentration of carbon dioxide increases, the brain’s respiratory centre stimulates the next breath.
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