File:A text-book of physiology, for medical students and physicians (1907) (14755218526).jpg

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Identifier: textbookofphysio1907howe (find matches)
Title: A text-book of physiology, for medical students and physicians
Year: 1907 (1900s)
Authors: Howell, William H. (William Henry), 1860-1945
Subjects: Physiology Physiology
Publisher: Philadelphia, London, W.B. Saunders Co.
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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ect. Thelow temperature Stimulates (lie sensory (cold) libers in the skin,and the nerve impulses thus aroused reflexly stimulate the vaso-constrietor center, or ;i pari of it,, and cause blanching of the skin.-iirc to high temperatures, on the contrary, Hushes the skin,and in this case we may suppose thai the sensory impulses carriedby the heal nerves inhibit the tone of the vasoconstrictor centerand cause dilatation or flushing of Hie skin. So far as man isconcerned, experiments made with the plethysmograph show verye Hunt, Journal of Physiology, 18,381, 1895. THE VASOMOTOR NERVES. 593 clearly that the vasoconstrictor center is easily affected in a pressoror depressor manner by psychical states* or activities. Mentalwork, especially mental interest, however aroused, is followed bya constriction of the blood-vessels of the skin,—a pressor effect (seeFig. 245); and we may find an explanation of the value of the reflexin the supposition that the rise of arterial pressure thus produced
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Fig. 246.—Effect of stimulating the central end of the depressor nerve of the heart ina rabbit. The time record marks seconds. On and off mark the beginning and end ofthe stimulation. The blood-pressure rises slowly after the removal of the stimulus andeventually reaches the normal level. This complete recovery is not shown in the portionof the record reproduced. (Daivson.) forces more blood through the brain (p. 608). On the other hand,feelings of embarrassment or shame may be associated with a de-pressor effect, a dilatation in the vessels of the skin manifested, forexample, in the act of blushing. In both cases we must assumeintracentral nerve paths between the cortex and the center in themedulla, the impulses along one path exciting the center, whilethose along the other inhibit its tone, or, as explained below, excite 594 CIRCULATION OF BLOOD AND LYMPH. a vasodilator center. Among the many depressor effects thathave been observed on stimulation of afferent nerve fibers onehas a

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  • bookid:textbookofphysio1907howe
  • bookyear:1907
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:Howell__William_H___William_Henry___1860_1945
  • booksubject:Physiology
  • bookpublisher:Philadelphia__London__W_B__Saunders_Co_
  • bookcontributor:Columbia_University_Libraries
  • booksponsor:Open_Knowledge_Commons
  • bookleafnumber:610
  • bookcollection:medicalheritagelibrary
  • bookcollection:ColumbiaUniversityLibraries
  • bookcollection:americana
  • BHL Collection
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29 July 2014

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