. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 156 COMPARATIVE PHYSIOLOGY. of the blood about &,000,000 for the male and 500,000 less for the female, which would furnish about 250,000,000,000 in a pound of blood. It will be understood that averages only are spoken of, as all kinds of variations occur, some of which will be referred to later, and their significance explained. The size of the corpuscles in the domestic animals is variable—a matter of importance when transfusion of blood is under considerat
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 156 COMPARATIVE PHYSIOLOGY. of the blood about &,000,000 for the male and 500,000 less for the female, which would furnish about 250,000,000,000 in a pound of blood. It will be understood that averages only are spoken of, as all kinds of variations occur, some of which will be referred to later, and their significance explained. The size of the corpuscles in the domestic animals is variable—a matter of importance when transfusion of blood is under consideration. Under the microscope the blood of vertebrates is seen to owe its color to the cells chiefly, and, so far as the red goes, almost wholly. Corpuscles when seen singly are never of the deep red, however, of the blood as a whole, but rather a yellowish red, the tinge varying some- what with the class of animals from which the specimen has been taken. Certain other mor- phological elements found in mammalian blood deserve brief mention, though their significance is as yet a matter of much dis- pute. 1. The blood-plates (plaques, hcematoblasts, third element), very small, colorless, biconcave disks, which are deposited in great numbers on any thread or similar foreign body introduced into the circulation, and rapidly break up when blood is shed. 2. On a slide of blood that has been prepared for some little time, aggregations of very minute granules (elementary gran- ules) may be seen. These are supposed to represent the disin- tegrating protoplasm of the corpuscles. The pale or colorless corpuscles are very few in number in mammals compared with the red, there being on the average only about 1 in 400 to 600, though they become much more numerous after a meal. They are granular in appearance, and possess one or more nuclei, which are not, however, readily. Pig. 141.—Corpuscles from human subject (Funke). A few colorless corpuscles are seen among the col- ored disks, which are
Size: 1583px × 1578px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1890, bookyear1890
