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Topic: Science
Number of pages / Number of words: 14 / 3819
Essay's paper body

At the base of the pharynx are

two openings. One, the esophagus, leads to the digestive system while the other, the glottis, leads

to the lungs. The epiglottis covers the glottis when swallowing so that food does not enter the

lungs. When the epiglottis is not covering the opening to the lungs air may pass freely into and out

of the trachea...


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Once in the lung the bronchi branch many times into smaller bronchioles which eventually

terminate in small sacs called alveoli. It is in the alveoli that the actual transfer of oxygen to the

blood takes place.

The alveoli are shaped like inflated sacs and exchange gas through a membrane. The passage of

oxygen into the blood and carbon dioxide out of the blood is dependent on three major factors:

1) the partial pressure of the gases, 2) the area of the pulmonary surface, and 3) the thickness of

the membrane (Gerking, 1969)...


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Competition leads to a more efficient use of resources Following Up on Leads GENERAL MOTORS LEADS THE CHARGE Descriptive Leads Respect leads to knowledge Wealth Leads to Moral Decay Abortion Legalized leads to Assault Aftermath Of Wwi Leads To Wwii The Effects Of Altitude On Human Physiology Death Leads to Matuarity Love Leads no where Animal Cruelty Leads to Human Violence Effects Of Altitude On Human Physiology Human Digestive System Does Poverty Leads To Crime?

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