Buy custom The Effects Of Altitude On Human Physiology
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| Topic: |
Science
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| Number of pages / Number of words: |
14 / 3820 |
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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