File:Kirkes' handbook of physiology (1907) (14583161219).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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it will be seen to oscillate with the heart-beats. This ex-periment shows that the pressure which the blood exerts upon the walls ofthe contained artery equals the pressure of a column of blood of a certainheight. In the case of the rabbits carotid it is equal to 90 to 120 cm. of blood,or rather more than the same height of water. In the case of the vein, if asimilar experiment be performed, blood will rise in the tube only for 8 or10 cm. or less. 188 THE CIRCULATION OF THE BLOOD The usual method of estimating the amount of blood pressure differssomewhat from the foregoing simple experiment. Instead of a simple straighttube of glass inserted into the vessel, a U-shaped tube containing mercury,the mercurial manometer, is employed. The artery is connected with themanometer by means of a small cannula which is inserted into the vessel,an arrangement being made whereby the cannula, tubes, etc., are filled witha saturated saline solution to prevent the clotting of blood when it is allowed
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Fig. 183.—Diagram of Ludwigs Kymograph and Mercurial Manometer. A, Revolving cylin-der, worked by a clock-work arrangement contained in the box (S), the speed being regulated by afan above the box; cylinder supported by an upright (b), and capable of being raised or loweredby a screw (a), by a handle attached to it; D, C, E, represent a mercurial manometer, a somewhatdifferent form of which is shown in the next figure. to pass from the artery into the apparatus. The loss of blood is preventedduring the preparation of the details of the experiment by a clamp or bull-dog forceps. The free end of the U-tube of mercury contains a very fineglass or metal rod with a bulb which floats upon the surface of the mercuryand oscillates with the oscillations of the mercury. As soon as there is freecommunication between the artery and the tube of mercury, the blood rushesout and pushes before it the column of mercury. The mercury will there-fore rise in the free limb of the tube, and will continue

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