An elementary physiology and hygiene for use in upper grammar grades . 94 PHYSIOLOGY AND HYGIENE change has been produced in the nature of the blood,and after clotting it would naturally be of no furtheruse, as it could no longer flow through the blood blood is taken out of the blood vessels, it alwaysclots in a very few minutes, no matter whether itis heated or cooled, or whether it is brought in con-tact with the air or not. So long as it remains inside. Fig. 31. — Showing the Clotting of A it is liquid ; at B it is solid. At C it is partly liquid again. the blood vessels
An elementary physiology and hygiene for use in upper grammar grades . 94 PHYSIOLOGY AND HYGIENE change has been produced in the nature of the blood,and after clotting it would naturally be of no furtheruse, as it could no longer flow through the blood blood is taken out of the blood vessels, it alwaysclots in a very few minutes, no matter whether itis heated or cooled, or whether it is brought in con-tact with the air or not. So long as it remains inside. Fig. 31. — Showing the Clotting of A it is liquid ; at B it is solid. At C it is partly liquid again. the blood vessels it continues in liquid form. If, how-ever, the blood vessels themselves are injured by a cutor bruise, the blood begins to clot rapidly near thewound. From this fact we learn how bleeding is a bruise or a cut breaks a blood vessel,the wound at once begins to bleed. But the injury tothe blood vessel causes a clotting in the blood near thebruise, and the clot soon closes the wound. As a result, CIRCULATION 95 any ordinary wound soon ceases to bleed; but if there isa large cut through a vein or an artery, the blood mayflow out so rapidly that it does not have time to such cases the bleeding must be stopped by a ligatureor some other artificial means. Effect of Gravity. — If we hold the hand downwardfor a few minutes, it becomes red, because it is filledwith blood. If, on the contrary, the hand is heldabove the head, it turns whiter.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysiology, bookyear1
