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In human beings respiration means air passing from the nose or mouth via respiratory passages to millions of balloon like sacs, called the alveoli in the lungs. The function of this respiration is to provide the energy the cells in any human body need because our cells get this energy mainly through metabolising glucose with oxygen and thus they need a constant supply of oxygen. Our waste products also need to be carried away by the metabolic process which is mainly carbon dioxide which must be carried away from the cells.

Our respiration includes the breathing of air into our lungs, the transfer of oxygen from the air into blood, the transportation of oxygen in our blood to our body cells , the metabolism of glucose with oxygen in our cells and the transport of carbon dioxide to the lungs to be breathed out. When we get involved in exercise, our respiration increases because it needs to compensate for higher energy demands by our muscle cells

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13y ago

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