Physiology and biochemistry in modern medicine (1918) (14594724447)

Identifier: physiologybioche00macl (find matches)

Title: Physiology and biochemistry in modern medicine

Year: 1918 (1910s)

Authors: Macleod, John James Rickard, 1876-1935 Pearce, R. G. (Roy Gentry), 1884-

Subjects: Physiology Biochemistry

Publisher: St. Louis : Mosby

Contributing Library: Columbia University Libraries

Digitizing Sponsor: Open Knowledge Commons

Text Appearing Before Image:

'

Text Appearing After Image:

B. Fig. 71.—Tracings showing the effects on the heartbeat of the frog resulting from stimulation ofthe sympathetic nerves prior to their union with the vagus nerve. (From Brodie.) and sympathetic are stimulated at the same time, as by exciting the vago-sympathetic in the frog, the first effect observed is that of the vagususually followed, after removal of the stimulus, by the sympathetic ef-fect. If the stimulus is maintained for a long time, so that the vagusbecomes fatigued, escapement will occur earlier than with pure vagusstimulation, and augmentation may become apparent. The sympatheticinfluence is, however, never so strong as that of the vagus. The twonerves are therefore not antagonistic in the sense that the one neutralizesthe effect of the other; but when both are stimulated, the heart respondsfirst to the vagus and later to the sympathetic. CHAPTER XXVITHE CONTROL OF THE CIRCULATION (Contd) THE NERVE CONTROL OF THE PERIPHERAL RESISTANCE As already explained, the nerve con

physiology and biochemistry in modern medicine 1918 book illustrations medical science physiology medicine biochemistry images from internet archive

1918

Columbia University Libraries

http://commons.wikimedia.org/

public domain