A text-book of physiology . 298 GRAPHIC EECORD OF HEART BEAT. [Book i. up and down. The piston again bears on a lever e by means of whichits movements may be registered. When the ventricle contracts, andby contracting diminishes in volume, there is a lessening of pressure in. Fig. 68. Purely diagrammatic figures of I. Perfusion cannula tied into frogs ventricle, a, entrance, h, exit-tube ; a, wallof ventricle ; )3, ligature, II. Roys apparatus modified by Gaskell. a, chamber filled with saline solutionand oil, containing the ventricle a tied on to the profusion cannula/; h, tube leadingto cyli
A text-book of physiology . 298 GRAPHIC EECORD OF HEART BEAT. [Book i. up and down. The piston again bears on a lever e by means of whichits movements may be registered. When the ventricle contracts, andby contracting diminishes in volume, there is a lessening of pressure in. Fig. 68. Purely diagrammatic figures of I. Perfusion cannula tied into frogs ventricle, a, entrance, h, exit-tube ; a, wallof ventricle ; )3, ligature, II. Roys apparatus modified by Gaskell. a, chamber filled with saline solutionand oil, containing the ventricle a tied on to the profusion cannula/; h, tube leadingto cylinder c, in which moves piston d, working the lever e. the interior of the chamber ; this is transmitted to the cylinder, andthe piston correspondingly rises, carrying with it the lever. As theventricle subsequently becomes distended, the pressure in the chamberis increased, and the piston and lever sink. In this way variations inthe volume of the ventricle may be recorded, without any great inter-ference with the flow of blood or fluid through it. The heart of the frog, as we have just said, will contiime tobeat for hours after removal from the body, even though the cavi-ties have been cleared of blood, and, indeed, when they are almostempty of all fluid. The beats th
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Keywords: ., bookautho, bookcentury1800, bookdecade1890, booksubjectphysiology
