Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] THE BLOOD 347 they feed by engulfing their prey. This fact has a very important bearing on the relation of colorless corpuscles to certain diseases caused by bacteria within the body. If, for example, a cut be- comes infected by bacteria, inflammation may set in. The bacteria form a poison known as a toxin, which causes this inflammation in their immediate neighborhood. Colorless corpuscles at once sur- round the spot and attack the
Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] THE BLOOD 347 they feed by engulfing their prey. This fact has a very important bearing on the relation of colorless corpuscles to certain diseases caused by bacteria within the body. If, for example, a cut be- comes infected by bacteria, inflammation may set in. The bacteria form a poison known as a toxin, which causes this inflammation in their immediate neighborhood. Colorless corpuscles at once sur- round the spot and attack the bacteria. If the bacteria are few in number, they are quickly eaten by the colorless corpuscles, which are known as 'phagocytes. If bacteria are present in great Diagram showing how colorless corpuscles pass between the cells that form the walls of the capillaries; 1,2, 3, 4< different stages. Hall. quantities, they may prevail and kill the phagocytes by poison- ing them. The dead bodies of the phagocytes thus killed are seen in the pus, or matter which accumulates in infected wounds. In such an event, we must come to the aid of the colorless corpuscle by washing the wound with some antiseptic, as weak carbolic acid or hydrogen peroxide. Number and Manufacture of Colorless Corpuscles.—The number of colorless corpuscles, although normally about 17,000 to a drop of blood, may vary, especially in certain diseases. They are formed in large numbeis within the lymph glands (collections of cells which are found here and there along the course of the lymph vessels). The spleen, a gland, and the marrow of bone are also believed to manufacture colorless corpuscles.
Size: 1752px × 1142px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
