The Human Body: An Account of Its Structure And Activities And the ...
The Human Body: An Account of Its Structure And Activities And the ...
Henry Newell Martin, Ernest Gale Martin
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112. This Fig. 112. — ^Mercuiy manometer for recording Mood pressure, dg, g^ass U-tube partly filled with mercury. In one limb is borne a float, «, bearing a recording de- vice; the other limb is filled with a suitable liquid and connected water-tight with the heart end of a divided artery. Changes in the merciuy level indicate changes of arterial pressure. instrument, on account of the great inertia of mercury, follows only slightly the rapid fluctuations of pressure due to the beats of the he...art. It therefore gives mean or average pressures. Re- sults obtained with mercury manometers are expressed in terms of the height of the mercury column sustained by the blood- pressure. To reduce them to columns of blood they must be multiplied by 13.6, the number of times mercury is heavier than blood. The mean aortic pressure in average-sized dogs is ordi* Digitized by VjOOQ IC THE CIRCULATION OF THE BLOOD 331 narily not far from 170 millimeters of mercury. The pressure in the veins diminishes from 3 or 4 millimeters of mercury in the large veins of the front leg to zero at the entrance to the auricle (see p.
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