File:Hand-book of physiology (1892) (14578610528).jpg

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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ctions, and so if Gaskells contention is correct that thenegative variation of the muscle current occurring on sympatheticstimulation is a sign of katabolism, the result of vagus stimula- CH. vi.) REGULATION OF THE PERIPHERAL RESISTANCE. 25 I tion, viz., a positive variation of the muscle current may besupposed to indicate the complementary condition of anabolism. 3. The amount of the blood passing into the hearts cavities.—Jt is found that in the body at any rate the amount of bloodwhich passes into the cavities of the heart distinctly affects thestrength of its beat. Thus if from any cause the blood isdiminished the contractions become much more feeble, althoughthey may possibly be increased in rapidity. Similarly with 4. The amount of pressure to be overcome.—If the aortic pressureis too low the muscle contractions of the heart is not so powerfulor effective as if the pressure is normal, whereas too great arterialpressure may be sufficient to delay if not to stop altogether the
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Fig. 200.—Plethysmograph. By means of this apparatus, the alteration in volume of thearm, e, which is enclosed in a glass tube, a, filled with fluid, the opening throughwhich it passes being firmly closed by a thick gutta-percha band, f, is communicatedto the lever, d, and registered by a recording apparatus. The fluid in a communicateswith that in b, the upper limit of which is above that in a. The chief alterations involume are due to alteration in the blood contained in the arm. When the volumeis increased, fluid passes out of the glass cylinder, and the lever, d, also is raised, andwhen a decrease takes place the fluid returns again from b to a. It will thereforebe evident that the apparatus is capable of recording alterations of blood-pressure inthe arm. Apparatus founded upon the same principle have been used for recordingalterations in the volume of the spleen and kidney. hearts beats, dilatation of its cavities taking place and a conditionof asystolism (Beau) resulting. Anot

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