The respiratory system runs from the tip of the nose to the smallest air sac deep in each lung. It shares a common passageway with the digestive tract as far as the larynx. The purpose of the respiratory system is to transport oxygen to the lungs, where it is absorbed into the blood. This then carries the oxygen to cells throughout the body, where it is used to produce energy Carbon dioxide, a by-product of the process, is taken back to the lungs and expelled.
The breathing process is controlled by the respiratory center of the brain. The purpose of respiration is to obtain oxygen, which is then transported around the body in the blood. It ends up in body cells, where it combines with glucose to produce energy Carbon dioxide is a by-product of this process, and is expelled on breathing out. Breathing is an automatic process: it cannot be stopped voluntarily, although its rate and depth can be controlled. An adult human takes between 13 and 80 breaths a minute, depending on the degree of exertion.
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