A treatise on physiology and hygiene for educational institutions and general readers .. . ts natural condition in the body ? Describe the process by which thecoagulation of blood takes place ?1§. If coagulation were impossible ? How is it in fact? THE CIRCULATION. 133 pressure ; for in a few minutes the clot will form and seal them still more serious cases, where the blood-vessel is of large size,the surgeon is obliged to tie a ligature about it, thus preventing theforce of the blood-current from washing away the clots, wirier^forming within and around the vessel, close it effectually.
A treatise on physiology and hygiene for educational institutions and general readers .. . ts natural condition in the body ? Describe the process by which thecoagulation of blood takes place ?1§. If coagulation were impossible ? How is it in fact? THE CIRCULATION. 133 pressure ; for in a few minutes the clot will form and seal them still more serious cases, where the blood-vessel is of large size,the surgeon is obliged to tie a ligature about it, thus preventing theforce of the blood-current from washing away the clots, wirier^forming within and around the vessel, close it effectually. II. It is worthy of remark that this peculiarity is early implantedin the blood, even before birth, and in advance of any existingnecessity for it—thus anticipating and guarding against danger. Butthis is not alL Of most of the inferior animals, which, as comparedwith man, are quite helpless, the blood coagulates more rapidly,and in the case of the birds, almost instantly. The relative com-position of fluid and coagulated blood may be thus represented: Fluid Blood. Coagulated 12. The Uses of the Blood.—The blood is the great providerand purifier of the body. It both carries new materials to all thetissues, and removes the worn-out particles of matter. This iseffected by the plasma. It both conveys oxygen and removes car-bonic acid. This is done through the corpuscles. Some singularexperiments have been tried to illustrate the life-giving power ofthe blood. An animal that has bled so freely as to be at the pointof death, is promptly brought back to life by an operation calledtransfusion, by which fresh blood from a living animal is injectedinto the blood-vessels of his body. {Read Note 2.) 2. The Work of the Blood.— The blood, which is our life, is a complexfluid. It contains the materials out of which the tissues are made, and alsothe debris which results from the destruction of the same tissues,—the worn-out cells of brain and muscle,—the cast-off clothes of
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