File:A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine (1885) (14781070792).jpg

Identifier: manualofhumanphy01land (find matches)
Title: A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine
Year: 1885 (1880s)
Authors: Landois, L. (Leonard), 1837-1902 Stirling, William, 1851-1932
Subjects: Physiology Histology
Publisher: Philadelphia, P. Blakiston, Son, and Company
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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Text Appearing Before Image:
he foot-support, and allow the writing-tambours to inscribe theirvibrations on a glass-plate attached to a tuning-fork. In the lower or cardiac impulse curve, Fig. 71, the rapidly-rising part is due tothe ventricular systole. It contains S vibrations (1 vib. =001G13 sec.). Thebeginning of the ventricular systole is indicated in the fig. by - 36 - 3 - 17. If the corresponding numbers in the upper or vibratory curve are studied, it isobvious that at the moment of ventricular systole the body males a downward vibration,i.e., it exercises greater pressure upon the foot - support. Gordon interprets hiscurve as giving exactly the opposite result. This downward motion, however,lasted only during 5 vibrations of the tuning-fork : during the last 3 vibrations,corresponding to the systole, there is an ascent of the body corresponding to a lesspressure upon the foot-plate. When the ventricle empties itself, it imdergoes amovement in a downward and outward direction—Gutbroclts reaction impulse.
Text Appearing After Image:
Fig. 71. The upper curve is the vibration-curve of a healthy person, and the lower one a tracing of the apex beat. In the upper curve analogous numbers are employed to indicate the vibrationsoccurring simultaneously, viz.,-28-11-10. The closure of the semi-lunar THE BLOOD-CURRENT. 159 valves is well marked in the three heart-beats at 20-20. This closure isindicated in analogous points in both curves, after which there is a descent of thefoot-support, and this corresponds to the downward propagation of the pulse-wavethrough the aorta to the vessels of the feet. In insufficiency of the aortic valves, as shown in Fig. 70, IV, the vibration com-municated to the body is very considerable. 81. The Blood-Current. The closed and much-branched vascular system, whose walls areendowed with elasticity and contractility, is not only completelyfilled with blood but it is over-filled. The total volume of the blood issomewhat greater than the capacity of the entire vascular system.Hence it follows th

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