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 . Fig. 5.—Dorsal Vessel of theSpider.—a, the abdomen; b,the dorsal vessel or heart; c, atrunk passing to the head ; d, d,vessels communicating with theorgans of respiration. Fig. G.—Circulation in Crustacea.•—a, heart; b, Lills; c, circulationthrough the body; d, arteries; c,veins. 56. Among the Crustacea—of which the crab, lobster,craw-fish, &c, are examples—there is a single sac or ven-tricle, which rec
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 . Fig. 5.—Dorsal Vessel of theSpider.—a, the abdomen; b,the dorsal vessel or heart; c, atrunk passing to the head ; d, d,vessels communicating with theorgans of respiration. Fig. G.—Circulation in Crustacea.•—a, heart; b, Lills; c, circulationthrough the body; d, arteries; c,veins. 56. Among the Crustacea—of which the crab, lobster,craw-fish, &c, are examples—there is a single sac or ven-tricle, which receives the blood from the gills, and propelsit to other parts of the body. (Fig. 6, and fig. 2, Pl. I.) 57. In fishes, we have a distinct heart with two cavities—an auricle or reservoir, and a ventricle or propellingorgan. {Fig. 7, and fig. 4, Pl. I.) 58. Eeptiles and the perfect amphibia, such as the frog How is the blood sent to the various parts of the body in insects? Howin the Crustacea? What is tne circulating apparatus in fishes?—what weptiles? THE BLOOD. 31 and the snake, have two auricles and one ventricle. {, and figs. 5 and 6, Pl. I.) <2/——,\. Fig. 7.—Circulation in Fishes.—a,heart; b, auricle; c, ventricle; d, circu-lation through the gills, or lesser circu-lation ; g, circulation through the body,or greater circulation; c, arteries; /,veins. Fig. 8.—Circulation in R«f-tiles.—a, heart; b. ventri-cle ; c, c, auricles. 59. In the mammalia (those animals which nurse theiryoung) and in birds, we find parts equivalent to two hearts,such as exist in fishes, with a complete double circulation.(Fig. 9.) The heart is constructed on the same generalplan in the entire group of warm-blooded animals, so thatthe heart of an ox, a sheep, or a dog, may be taken toillustrate the human heart. 60. The form of the double heart is somewhat like apear, as represented in fig. 1, Pl. II. and fig. 1, Pl. man, it is situated in the front part of t
Size: 1717px × 1456px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, booksubjectphysiologicalprocess
