File:Carpenter's principles of human physiology (1881) (14781179142).jpg

Identifier: carpentersprinci00carp (find matches)
Title: Carpenter's principles of human physiology
Year: 1881 (1880s)
Authors: Carpenter, William Benjamin, 1813-1885 Meneses, Henry Power
Subjects: Human physiology Physiology
Publisher: London : J. & A. Churchill
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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ris introduced to cause it to be slightly prominent. This is applied firmly, bymeans of bands to the chest-wall, and the movements of the chest are theneasily registered. A minute investigation of the variations of pressurein ordinary respiration has been made by Ewald with a specially modifiedmanometer, and the accompanying diagram represents an analysis of a normal * The pause which was admitted by Vierordt and others to occnr between Expiration andInspiration, has been shown by Kiegel (Wurzburg. Med. Gesell., Band vii. 1867, p. 321),with a self-registering apparatus, not to be present, at least when the body is in a horizontalposition. t Sibson, Med.-Chir. Transact., vol. xxxi., and Medical Anatomy. GENERAL STRUCTURE OF THE RESPIRATORY ORGANS. 351 respiratory pressure curve. In the first place the very regular transition ofinspiration into expiration may be observed. The line D to F crossing theabscissa without the slightest notch or indent, which can only result from the Fig. 168.
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Diagram of a normal tracing of the respiratory pressure. The tracing is to be read from rightto left. The part below the horizontal line or abscissa corresponds to the period of inspiration,and indicates negative pressure; the part above the abscissa corresponds to the period of expira-tion, and indicates positive pressure. The point where the curve cuts the abscissa is the momentwhere inspiration passes into expiration, and the point a is the moment where expiration passesinto inspiration. inspiratory pressure steadily diminishing to zero (at the point e), and theexpiratory pressure rising equally uniformly. The same regularity is observedin the line h to b, representing the passage of the expiration into inspiration.This takes place more gradually ; that is to say, the expiration is a little longer,but in exactly the same way. The curve cuts the abscissa without anyindent, as a straight line, but at so slight an angle that it is often almostcoincident with the abscissa itself. From

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