Identifier: handbookofphysio00bake (find matches)
Title: Hand-book of physiology
Year: 1892 (1890s)
Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed
Subjects: Physiology Human physiology
Publisher: London : John Murray
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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222 CIECULATION OF THE BLOOD. (ch. VI. stroke and downstroke, because they are universally taken tomean the sudden injection of blood into the already full arteries,and the gradual fall of the lever signifying the recovery of thearteries by their recoil. These points may be demonstrated on asystem of elastic tubes, with a syringe to pump in water atregular intervals, just as well as on the radial artery, or on themore complicated system of tubes in which the heart, the arteries,the capillaries and veins are represented, which is known as an
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Fig. 185.—Diagram of the formation of the pulse-tracing, a, percussion -nave; b, tidalwave; c, dicrotic wave. (Mahomed.) arterial schema. If we place two or more sphygmographs uponsuch a system of tubes at increasing distances from the pump,we may demonstrate first, that the rise of the lever commencesearliest in that nearest the pump, and secondly, that it is higherand more sudden, while at a longer distance from the pump thewave is less marked, and a little later. So in the arteries of thebody the wave of blood gradually gets less and less as weapproach the periphery of the arterial system, and is lost in thecapillaries according to Mahomed. By the sudden injection ofblood two distinct waves are produced, which are called the tidaland percussion waves. The tidal wave occurs whenever fluid isinjected into an elastic tube (fig. 185, b), and is due to theexpansion of the tube and its more gradual collapse. The per-cussion wave occurs (fig. 185, a) when the impulse imparted tothe flui

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