The Physiology of Man; Introduction. the Blood. Circulation. Respiration. 1866

The Physiology of Man; Introduction. the Blood. Circulation. Respiration. 1866

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1866 edition. Excerpt: ...produces, in the smaller vessels, very little movement or dilatation; but when the current is obstructed, as by ligation, or even compression with the linger, the force of the heart is not sent through the vessel to the periphery, but is arrested, and therefore becomes more marked and easily appreciated. In vessels which have become undilatable and incompressible from calcareous deposit, the pulse cannot be felt. The character of the pulse indicates, to a certain extent, the condition of the heart and vessels. We have spoken, when treating of the heart, of the varying rapidity of the pulse, as it is a record of the rapidity of the action of this organ; but it remains for us to consider the mechanism of its production, and its various characters. Under ordinary circumstances, the pulse may be felt in all arteries which are exposed to investigation; and as it is due to the movement of the blood in the vessels, the prime cause of its production is the contraction of the left ventricle. The late very interesting experiments of M. Marey have shown that the impulse given to the blood by the heart is not felt in all the vessels at the same instant. By ingenious contrivances, which will be described further on, this observer has succeeded in registering simultaneously the impulse of the heart, the pulse of the aorta, and the pulse of the femoral artery. He has thus ascertained that the contraction of the ventricle is anterior to the pulsation of the aorta, and the pulsation of the aorta precedes the pulse in the femoral.1 This only confirms the views of other physiologists, particularly Weber, who described this progressive retardation of the pulse as we recede from the heart, estimating the difference between the ventricular systole and the pulsation of...
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Product details

  • Paperback | 156 pages
  • 189 x 246 x 8mm | 290g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236560280
  • 9781236560285