The laws and mechanics of circulation, with the principle involved in animal movement . Pig. 143.—Diagram of Young Embryo (Chick) and its Vessels, showing circulation ofumbilical vesicles, and also that of allantois, beginning to be formed.— Pig. 144.—Human Embryo in the Third Week.—Haeckel. «, Large globular yolk sac ;b, allantois ; c, amnion ; d, tufted chorion. There are yet no limbs. In the case of the bird, the pumping action in the abdomen(the soft hinder parts of the bird) for pumping air and bloodthrough the alveoli, is set up in the latter days of incubation,when rapid atrophi
The laws and mechanics of circulation, with the principle involved in animal movement . Pig. 143.—Diagram of Young Embryo (Chick) and its Vessels, showing circulation ofumbilical vesicles, and also that of allantois, beginning to be formed.— Pig. 144.—Human Embryo in the Third Week.—Haeckel. «, Large globular yolk sac ;b, allantois ; c, amnion ; d, tufted chorion. There are yet no limbs. In the case of the bird, the pumping action in the abdomen(the soft hinder parts of the bird) for pumping air and bloodthrough the alveoli, is set up in the latter days of incubation,when rapid atrophic changes soon separate the umbilical ves-sels, and, breaking the now attenuated and fragile shell wall 348 PHYSIOLOGY OF TIIE CIRCULATION. with its beak, it finally makes its escape, leaving the allantoicand atrophied membranes behind.
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Keywords: ., bookcentury1800, bookde, booksubjectblood, booksubjectrespiration
