. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 386 ZOOLCX^T enlarged and occupy great spaces of the body and even com- municate with the cavities of the t)ones. These air-sacs serve not only to diminish the sijccific gravity of the body, Ijut also as reservoirs to receive the tidal air. From these reservoirs some of the air is no doubt absorbed by the l)lood and other fluids of the body; but the reservoirs are jieriodically emptied through the air-tube, as are the terminal sacs in our own lungs. Organs and Func- tions of Circula- tion. — The heart is co
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 386 ZOOLCX^T enlarged and occupy great spaces of the body and even com- municate with the cavities of the t)ones. These air-sacs serve not only to diminish the sijccific gravity of the body, Ijut also as reservoirs to receive the tidal air. From these reservoirs some of the air is no doubt absorbed by the l)lood and other fluids of the body; but the reservoirs are jieriodically emptied through the air-tube, as are the terminal sacs in our own lungs. Organs and Func- tions of Circula- tion. — The heart is completely divided into a right and a left side, as in man. Each side has a re- ceiving chamber or auricle, and a dis- charging chamber or ventricle.' The im- pure blood from the tissues is received l\v the right auricle, passes to the right ventricle, and thence is pumped into a pairerl pulmonary' artery, of which one branch goes to each lung, wIktc it l)reaks up into capillaries. The re- collected, oxygenated blood is returned to the left auricle, 1 Fig. Fig. . — The lungs of the pigeon, togetlier with the lower end of the traehea, viewed from the ventral side ; tr, trachea with the syrinx (sy) at its lower end where the two bronchii (hr) branch off, eventually dividing into branches. br', hr". The pulmonary arter>' enters at , and the vein leaves at "With the lungs, various air sacs are connected at , the anterior thoracic; at the posterior thoracic; at /). the abdominal ; at !<lij:, the interclavicular, and at , the cervical. From Parker's ";. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
