File:Hand-book of physiology (1892) (14578586208).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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Fig. 171.—Endocardial pressure-curve from the left ventricle. The thorax was openedand a cannula introduced through the apex of the ventricle; abscissa is line of atmo-spheric pressure, g to d represents ventricular contraction ; from d to the next rise atg represents the ventricular diastole. The notch at the top of which is f is a post-ventricular rise in pressure from below that of the atmosphere and not a pre-systolic orauricular rise in pressure. nesses; or 2nd, by varying the distance between the holders (g.g)and the central part of the steel ribbon to which the lever isattached. Rollestons conclusions are as follows :— 1. That there is no distinct and separate auricular contractionmarked in the curves obtained from either right or left ventricles,
Text Appearing After Image:
Fig. 172.—Curve with dicrotic summit from left ventricle ; abscissa shows atmospheric pressure. the auricular and ventricular rises of pressure being merged intoone continuous rise. 2. That the auriculo-ventricular valves are closed before anygreat rise of pressure within the ventricle above that whichresults from the auricular systole (a, fig. 172). The closure ofthe valve occurs probably in the lower third of the rise a b (fig.172), and does not produce any notch or wave. ch.vi.) FORCE AND FREQUENCY OF THE HEARTS BEAT. 203 3. That the semilunar valves open at the point in the ventricularsystole, situated (at g) about or a little above the junction of themiddle or upper third of the ascending line (a b), and the closureabout or a little before the shoulder (d). 4. That the minimum pressure in the ventricle may fall belowthat of the atmosphere, but that the amount varies considerably. Frequency and Force of the Hearts Action. The heart of a healthy adult man contracts about 72 times

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