The American Medical Monthly Volume 13-14

The American Medical Monthly Volume 13-14

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1860 edition. Excerpt: ... you see that the mercury rises in the cardiometer. The rise of the mercury is in proportion to the pressure exerted by the syringe, and the resistance at the other end of the tube. But as soon as I let go the end of the tube, and allow the water to flow out freely, the mercury, you observe, instantly falls again in the cardiometer. When this instrument is to be employed for testing the force necessary for the capillary circulation, the free end of the flexible tube is attached to an artery by a brass armature, and the vessels of the part are then injected with defibrinated blood, until the injected fluid returns freely by the corresponding vein. The rise of the mercury in the cardiometer will then show the exact pressure required, to make the blood pass through the capillaries, and into the venous system. It is a necessary precaution, however, before trying the experiment, to inject the vessels of the part freely with defibrinated blood, from a common syringe, immediately after the death of the animal; otherwise, the blood would coagulate in the capillaries, and thus interfere with the success of the experiment. In this way, Dr.Sharpey found, that when the free end of the tube was attached to the mesenteric artery of the dog, a pressure of 90 millimetres of mercury caused the blood to pass through the capillaries of the intestine and of the liver; and that under a pressure of 130 millimetres it flowed in a full stream from the divided extremity of the vena cava. Poisseuille had already discovered that a pressure of 143 millimetres was suflicieut to force the serum of the blood through the capillaries of the kidney. 1 have done the same experiment, with defibrinated blood, upon the vessels of the lower extremity, by placing the end of the...show more

Product details

  • Paperback | 420 pages
  • 189 x 246 x 22mm | 744g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236742117
  • 9781236742117