Conversations On the Animal Economy Designed for the Instruction of Youth And T
Conversations On the Animal Economy Designed for the Instruction of Youth And T
Isaac Ray
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Nutrition. Dr. B. To day we are to consider the changes which the blood undergoes in its passage through the lungs, and the mechanism of the parts concerned in producing them. The respiratory organs are two light, spongy, and rather irregularly shaped bodies, placed in the tho- rax, or chest, one on each side, called the Lungs. -^- They are composed almost entirely of air-cells and blood vessels, though some other tissue is probably pre- sent, which serves as a common bond of union. These littl...e air-cells, which are of extreme minuteness, are distributed to every portion of the organ, and seem to be the ultimate ramifications of two large tubes, which lead, one to each lung, called the bronchiae. The blood vessels belong to the capillary system, and communicate with the pulmonary arteries and veins. They are situated in the tissue of the cells, and it is while the blood is passing through them, that it is subjected to the respiratory process. The bronchiae are the subdi- visions of a single tube, called the trachea, or windpipe.
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