Publisher's Synopsis
Excerpt from Twentieth Century Practice, Vol. 16 of 20: An International Encyclopedia of Modern Medical Science
The lung differs from all other structures in having two separate circulations: the nutritive, supplied from the left side of the heart through the bronchial arteries, and the functional, supplied from the right Side of the heart through the pulmonary artery. This double circulation underlies all the phenomena of pneumonia, and must be recognized in any definition of the disease, as without it the disease itself could not exist.
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