Breathing
Breathing is the process that moves air in and out of the lungs or oxygen through other breathing organs such as gills. Aerobic organisms of these types—such as birds, mammals, and reptiles—require oxygen to release energy via respiration, in the form of the metabolism of energy-rich molecules such as glucose. Breathing is only one process that delivers oxygen to where it is needed in the body and removes carbon dioxide. Another important process involves the movement of blood by the circulatory system. Gas exchange occurs in the pulmonary alveoli by passive diffusion of gases between the alveolar gas and the blood in lung capillaries. Once these dissolved gases are in the blood, the heart powers their flow around the body (via the circulatory system). The medical term for normal relaxed breathing is eupnea.
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Famous quotes containing the word breathing:
“What, really, is wanted from a neighborhood? Convenience, certainly, an absence of major aggravation, to be sure. But perhaps most of all, ideally, what is wanted is a comfortable background, a breathing space of intermission between the intensities of private life and the calculations of public life.”
—Joseph Epstein (b. 1937)
“You have been here only a short time, Mr. Barnard. You cannot know what it is to live here month upon month, year after year, breathing this infernal air, absorbing the miasma of barbarity that permeates these walls, especially this chamber.”
—Richard Matheson (b. 1926)
“And each of the huge white creatures was huger than fourscore men;
The tops of their ears were feathered, their hands were the claws of birds,
And, shaking the plumes of the grasses and the leaves of the mural glen,
The breathing came from those bodies, long warless, grown whiter than curds.”
—William Butler Yeats (1865–1939)