Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . heart. Figure 2.——Section of the Heart, showing its Cavities and Partitions or Septa.—a,Right auricle, b, Right ventricle, c, Left auricle, d, Left ^ntricle. e, Aorta. /, Pul-monary veins, g, Superior vena cava. ,;, Right pulmonary veins, k, Left pulmonaryveins. Fiqurb 3. Ideal View of the Circulation.—a, Right auricle. 6, Tho entrance of the superior vena cava, c, The inferior vena cava, d, Tricuspid v
Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . heart. Figure 2.——Section of the Heart, showing its Cavities and Partitions or Septa.—a,Right auricle, b, Right ventricle, c, Left auricle, d, Left ^ntricle. e, Aorta. /, Pul-monary veins, g, Superior vena cava. ,;, Right pulmonary veins, k, Left pulmonaryveins. Fiqurb 3. Ideal View of the Circulation.—a, Right auricle. 6, Tho entrance of the superior vena cava, c, The inferior vena cava, d, Tricuspid valves, e, Right , Pulmonary artery, g, g, Branches of pulmonary artery, A, A, Capillary vessels of tholungs, i, Pulmonary veins, j, Left auricle, k, Bicuspid valve. I, Left ventricle, of the aorta, n, m, Arteries which distribute the blood to the head and upper ex-tremities, o, Descending aorta, p, p, Capillary vessels of the systemic circulation. Fioure 4. Capillaries.—This figure represents a highly magnified view of the ar-rangement of the capillaries, between the branches of the arteiies and veins, as found incm intestinal villus. «, Arteries, b, THE BLOOD. 27 CHAPTER III. THE BLOOD. 43. In all organized beings, the process of nutrition iscarried on by means of a circulating fluid. In plants, tinsfluid is called sap; in animals, it is called blood. 44. The blood of insects is white or colorless. In fishes,it is red in the gills, heart, and liver; but nearly colorlessin the main bulk of the body. In the mammalia, birds,and reptiles, it is of a dark purple color when drawn froma vein, and of a bright scarlet when it comes from anartery. It emits an odor peculiar to the animal fromwhich it is taken. 45. In a few minutes after blood is taken from a livinganimal, it begins to coagulate, and become solid, like asoft jelly. If allowed to stand for a few hours, the clotwill be found diminished in size, but firmer than before,and floating in the
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