Elements of human physiology / by L. Hermann ; translated from the sixth edition by Arthur Gamgee.

  • Gamgee Arthur, 1841-1909.
Date:
1878
Catalogue details

Licence: Public Domain Mark

Credit: Elements of human physiology / by L. Hermann ; translated from the sixth edition by Arthur Gamgee. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    graph-tambour. This, however, commences to risQ in a remark- able manner at s v, where the dotted ordinate cuts the line, and an irregular curve of considerable extent is traced; this curve, in the Fig. 4. TRACINGS OF THE AUKICULAR AND VENTRICULAR ENDOCARDIAL PRESSURE, WITH SIMULTANEOUS CARDIOGRAPH TRACING (MAREV). A (highest line) indicates the changes in pressure in the auricle. The line is marked by one abrupt curve caused by the auricular sj'stole. V (middle line) indicates the chanjjes in pressure in the ventricle. C I (lowest line) indicates the tracing of the cardiac impulse obtained by means of the cardiograph. The lir.-t dotted ordinate, as, cuts the sinuous line at the time when auricular systole commences. The second dotted ordinate, sv, cuts it when ventricular systole commences. cardiograph tracing, is observed to coincide with that in the second tracing, which is caused by the ventricular systole.] Movement of the Blood in the Vessels. Causes. If we imagine the vascular system filled with blood, but with every impulse to motion absent, the blood will stand everywhere within it under equal pressure, which, however, is greater than would be caused by its own weight—a proof that the volume of the blood is greater than the natural capacity of the vascular system (Brunner '). If in such a system the pressure be suddenly made unequal in two places, a current will be immediately set up I Brunner, Die mittlere Spannung im Gej&sssystem. ZUrich, 1854.