The laws and mechanics of circulation, with the principle involved in animal movement . action in the vessels, driving the bloodtoward the heart and lungs; and which proves incontro-vertibly an independent action in the vessels themselves. iSo,then, the force to the tissue circulation is not in the heart,which singly assists it, the main force being actually uponthe ground where the work is done, in the walls of the vesselsthemselves, which regulate their own circulation, and mustdo so in order to maintain autonomy in the tissues, which isessential to existence. The sudden, perpendicular leap
The laws and mechanics of circulation, with the principle involved in animal movement . action in the vessels, driving the bloodtoward the heart and lungs; and which proves incontro-vertibly an independent action in the vessels themselves. iSo,then, the force to the tissue circulation is not in the heart,which singly assists it, the main force being actually uponthe ground where the work is done, in the walls of the vesselsthemselves, which regulate their own circulation, and mustdo so in order to maintain autonomy in the tissues, which isessential to existence. The sudden, perpendicular leap made in the tissue tracings(a) when arterial compression is relieved, is the product of thecombined action in the vessels, aided, of course, by the press-ure in the arterial system, compelling the blood into thevessels with the energy of expansile action ; and which soonrestores the normal rhythm in the vessels and the volume ofthe hand, indicated by the rise in the curve of the tissue trac-ings, sending it above the horizontal line, and the reappear- THE FOliCii IN THE TISSUES. 169. 170 THE FORCE IN THE TISSUES. ance of dicrotism and arterial movement. And that it isproduced by the action in the vessels in the manner as statedis fully proven by the straight, perpendicular line (c),which answers to diastole in the vessels, and which wehave seen the heart, of itself, is utterly incapable of pro-ducing unassisted by the action in the vessels, requiringexpansile action in the vessels themselves in order to effectit. At the same time, the over-distension which this pro-duces in the capillaries, the blood rushing into them fromthe pressure in the arterial system, tends momentarily tochoke the action; hence, the small and imperfect rhythmsimmediately succeeding the diastole. Furthermore, we knowthat contraction must possess its equivalent in expansion, sothat the previous contraction in the vessels must have itsrepresentation in this expansile effort, the one involving theother, expa
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