The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . t of Haemorrhage.—Whenthe haemorrhage has thus been temporarily arrested,the pressure must in some way be kept up untilthere is no danger of a fresh burst on its method of permanently arrestmg bleeding-is this: It has been before stated that blood willcoagulate not only outside the vessels, but insidethemx, if its fre
The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . t of Haemorrhage.—Whenthe haemorrhage has thus been temporarily arrested,the pressure must in some way be kept up untilthere is no danger of a fresh burst on its method of permanently arrestmg bleeding-is this: It has been before stated that blood willcoagulate not only outside the vessels, but insidethemx, if its free motion is interfered with. Now, iffrom the contraction of the vessels, or coagulationof the blood which has flowed from them, or in con-sequence of pressure artificially applied, or for anyother reason, the current of blood in the artery isstopped at the severed end, the fibrin of the bloodbegins very soon to coagulate inside the vessel, andthis coagulation extends from the cut end backwardtoward the heart to a point where the circulationbecomes free and unobstructed, that is, to the pointat which some branch artery is given off from thewounded one (Fig. 48). Thus the coagulum (orclot) formed will vary, according to circumstances. 184 ORGANS OF REPAIR,. Fig. 48.—Clot inan artery thathas been tied. from an eighth of an inch or less to an inch inlength. If the compression or other obstructioncontinues long enough to allow of it,this coagulum becomes firmly • at-tached to the inside of the vessel, andforms a plug which effectually andpermanently closes it, and, as thewound heals, this plug and the wallsof the now useless artery become grad-ually absorbed until a mere threadremains, and even this may disappearso as to leave no trace of the vesselwhich formerly existed. But it is tobe considered that during the forma-tion of this plug, and its attachment tothe walls of the vessel, it has to re-ceive the impulse of the blood continually drivenagainst it seventy times a minute
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