File:A text-book of physiology for medical students and physicians (1911) (14778999695).jpg

Identifier: textbookofphysio1911howe (find matches)
Title: A text-book of physiology for medical students and physicians
Year: 1911 (1910s)
Authors: Howell, William H. (William Henry), 1860-1945
Subjects: Physiology
Publisher: Philadelphia, London, W.B. Saunders company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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by the blood will be correspondingly shorter * For an account of the life and works of this physiologist see Dawson,The Johns Hopkins Hospital Bulletin, vol. xv, Nos. 159 to 161, 1904.f Poiseuille, Recherches sur la force du cceur aortique. Paris, 1828.j Ludwig, Midlers Archiv f. Anatomie, Physiologie, etc., 1847, p. 242 480 CIRCULATION OF BLOOD AND LYMPH. and all the fluctuations will be similarly reduced. Poiseuilleplaced the mercury in a U tube of the general form shown in Fig.l9l, M. One leg was connected with the interior of an artery byappropriate tubing filled with liquid and when the clamp wasremoved from the vessel its pressure displaced the mercury in thelimbs by a certain amount. The difference in height between thelevels of the mercury in the two limbs in each experiment gives theblood pressure, which is therefore usually expressed as being equalto so many millimeters of mercury. By this expression it is meantthat the pressure within the artery is able to support a column
Text Appearing After Image:
Fig. 191.—A, Schema to show the recording mercury manometer and its connectionwith the artery: M, The manometer with the position of the mercury represented in black(the pressure is given by the distance in millimeters between the levels 1 and 2; one-half ofthis distance is recorded on the kymographion by the pen, P); F, the float resting upon thesurface of the mercury; G, the cap through which the stem carrying the pen moves; E, offsetfor driving air out of the manometer and for filling or washing out the tube to the artery;R, the receptacle containing the so.ation of sodium carbonate; c. the cannula for insertioninto the artery; w, the washout arrangement shown in detail in B. B, The washout cannula: c, the glass cannula inserted into the artery; r, the stemconnected with the reservoir of carbonate solution; o, the stem connected with the manom-eter. The arrows show the current of carbonate solution during the process of washingout, the artery at that time being closed by a clamp.

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