. Animal biology; Human biology. Parts II & III of First course in biology. Biology. HUMAN BIOLOGY lower than its middle (Fig. 73); the lungs descend with it, thus lengthening the chest from top to bottom; at the Inferior vena cava (Esophagus. Aorta Internal ligament External ligament FIG. 74. — DIAPHRAGM (or midriff), seen from below. (Cunningham.) The central portion (light) is tendinous. As the diaphragm descends, it acts like the piston of a great pump and the blood is forced up through the vena cava, and the lymph through the thoracic duct (Fig. 66). \ same time the ribs are raised up
. Animal biology; Human biology. Parts II & III of First course in biology. Biology. HUMAN BIOLOGY lower than its middle (Fig. 73); the lungs descend with it, thus lengthening the chest from top to bottom; at the Inferior vena cava (Esophagus. Aorta Internal ligament External ligament FIG. 74. — DIAPHRAGM (or midriff), seen from below. (Cunningham.) The central portion (light) is tendinous. As the diaphragm descends, it acts like the piston of a great pump and the blood is forced up through the vena cava, and the lymph through the thoracic duct (Fig. 66). \ same time the ribs are raised upward and outward (Fig. 76) by the contraction of the outer set of muscles between the ribs. Thus the cJicst is made longer, broader, and deeper from front to back. The lungs expand when the chest expands, and the air rushes in. Why is this? The lungs contain no muscles and cannot expand themselves ; the air cannot be pulled in, for its parts do not stick to- gether. The true reason is that the air has weight. The. 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan Co.
Size: 1679px × 1488px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1910
