File:Kirkes' handbook of physiology (1907) (14766650671).jpg

Identifier: kirkeshandbookof00kirk (find matches)
Title: Kirkes' handbook of physiology
Year: 1907 (1900s)
Authors: Kirkes, William Senhouse, 1823-1864 Greene, Charles Wilson, 1866-1947
Subjects: Physiology
Publisher: New York, W. Wood and company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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uence can bedetermined without difficulty. Make this determination for the ventricle,auricle, and sinus venosus by direct observation. THE CIRCULATION OF THE BLOOD Prepare a cardiac lever as shown in figure 211, taking special care to ar-range the foot so that it will not bind on the lever when in motion. Adjustthe foot of the lever on the exposed ventricle and bring its point to write onthe smoked paper of a recording cylinder. This cylinder should travel atthe rate of about 1 cm. per second and its speed be determined by the writingpoint of an electric magnet which is connected with the electric-clock circuitmarking seconds. Take care to adjust the time magnet in a vertical linewith the writing point of the heart lever, placing the heart lever about 1 cm.above the magnet lever. The tracing of the ventricles movement, or cardio-gram, will show alternate contraction, relaxation, and pause of the ventricle.It will also enable one to measure the exact proportion of the total time of the
Text Appearing After Image:
Fig. 212.—Cardiogram Showing Contractions of the Auricle, a, and Ventricle, v, of a Frog. Time inseconds. The record shows the sequence of the auricle and ventricle. (New figure by Dooley.) cardiac cycle consumed by the systole and diastole, and also that portion ofthe diastole in which the ventricle is wholly at rest. After one has obtained the ventricular tracings and has learned the diffi-culties of adjusting the apparatus, a second heart lever should be adjustedso that its foot rests upon the auricle, and the auricular movements maytherefore be traced on the smoked paper of the recording cylinder at the sametime as those of the ventricle. If some care is taken to adjust these twowriting points in a vertical line a splendid tracing showing synchronismbetween auricle and ventricle is obtained. Measure the rate and the timeof the different phases of the contraction of the auricle and ventricle andtabulate them in the following form, always expressing fractions in thedecimal svstem:

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