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:
“Ere I could
Give him that parting kiss which I had set
Betwixt two charming words, comes in my father,
And like the tyrannous breathing of the north
Shakes all our buds from growing.”
—William Shakespeare (1564–1616)
“On like the wind they hurried, and Morgan rode in advance;
Bright were his eyes like live coals, as he gave me a sideways
glance;
And I was just breathing freely, after my choking pain,
When the last one of the troopers suddenly drew his rein.”
—Constance Fenimore Woolson (1840–1894)
“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)