. Elements of human physiology. Physiology. THE VASCULAR MECHANISM 261 in the course of the experiment by some artificial means, such as the injection of leech extract, or the defibrination^ of the circulating blood. A convenient way of measuring the venous outflow is to let the blood drop on a mica disc attached to a Marey's tambour, from which a tube is carried to a registering tambour. Every drop is recorded on a moving surface by a little elevation of the lever of the registering tambour. 4. The volume of an organ is largely dependent on the amount of blood contained within its vessels. &q
. Elements of human physiology. Physiology. THE VASCULAR MECHANISM 261 in the course of the experiment by some artificial means, such as the injection of leech extract, or the defibrination^ of the circulating blood. A convenient way of measuring the venous outflow is to let the blood drop on a mica disc attached to a Marey's tambour, from which a tube is carried to a registering tambour. Every drop is recorded on a moving surface by a little elevation of the lever of the registering tambour. 4. The volume of an organ is largely dependent on the amount of blood contained within its vessels. "VVe can there- fore judge of the nature of changes in the circulation through an organ by taking a graphic record of its volume. For this purpose we use an instrument known as a plethysmograph or oncometer, of which many forms have been devised. Fig. Diagram of oncometer. Fig. 144 represents diagrammaticaily the structure of Roy's kidney oncometer. This is a metal capsule, the two halves of which are jointed together, and are accurately fitted to one another except at (h), where a small hole is left for the exit of the kidney vessels and ureters. A delicate animal membrane (m) is attached to the rim of each half of the oncometer, the space between this and the brass capsule being filled with warm oil. The kidney (k) rests inside, supported ' In dogs and cats the blood may be rendered uncoagulable by drawing off half the blood, defibrinating it, and reinjecting it into the circulation. This process is repeated five or six times, when it is found that the blood is no longer coagulable—a condition which lasts for many houi' Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
Size: 1490px × 1676px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiology, bookyear1
