Lungs

Lungs Just as a fire needs type O to burn, the human body also needs a around-the-clock supply of this essential element for the process of combustion that goes on constantly in every cell. We ordinarily do not think of a body metabolism as combustion, in so far that is what is: the controlled burning of carbohydrates, fats, and proteins to provide energy. The job of the respiratory system is to fork out the oxygen that combines with these fuels in each of the billions of cells, and to carry away the flub product of carbon dioxide.

And so we breathe - fourteen clock a minute, a pint of air per breath, more than cristal thousand quarts of air a day. Not all that comes in, of course, is oxygen. merely about one - fifth of the air we breathe is this animateness - sustaining element. But it makes up an important part of our bodies and our lives. At each given moment, half the bodys weight is oxygen. The overwhelming portion, incidentally...If you want to amaze a full essay, order it on our website: Orderessay

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