. Animal biology; Human biology. Parts II & III of First course in biology. Biology. FIG. 62. — BLOOD CLOT separated from serum. Some impurities and a large amount of water escape from the blood as it passes through the skin. Coagulation. - - So long as blood is in an uninjured blood vessel it remains a liquid. In a few minutes after it flows from a blood vessel, it forms into a stiff, jelly like mass called a clot (Fig. 62). The process of forming the clot is called coagulation, and it is brought about by the albuminous substance called fibrin, which is always in the plasma of healthy blo
. Animal biology; Human biology. Parts II & III of First course in biology. Biology. FIG. 62. — BLOOD CLOT separated from serum. Some impurities and a large amount of water escape from the blood as it passes through the skin. Coagulation. - - So long as blood is in an uninjured blood vessel it remains a liquid. In a few minutes after it flows from a blood vessel, it forms into a stiff, jelly like mass called a clot (Fig. 62). The process of forming the clot is called coagulation, and it is brought about by the albuminous substance called fibrin, which is always in the plasma of healthy blood. On expos- ure to air the fibrin forms into a net- work of fine tJireads tJirougJwnt tJie mass (Fig. 63) and the corpuscles become entangled in the meshes. The clot consists of the fibrin of the plasma and corpuscles ; the watery portion of the plasma, called the serum, separates from the clot (Fig. 62). The property of coagulating is a great safe- guard, as a clot often plugs up a cut blood vessel. What is the difference between se- rum and plasma ? Veins and Arteries com- pared. - The veins have tJiin, soft walls and the arteries have tJiick, tongJi, elastic walls. When a vein is cut, it may FIG. 63. —NETWORK OF FIBRIN IN usually be closed by pinching HUMAN BLOOD (enlarged). tne waus Qf the end together. If an artery is cut, the walls will not readily stick together, but often stand open until the end of the artery is tied. For this reason, and because an artery is subject to the direct pressure of the heart, a cut artery is more dangerous. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan Co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1910
