. The endocrine organs; an introduction to the study of internal secretion . at. FIG. 24.—Effect upon the blood-pressure of injecting thyroid extract intravenously. ftp., arterial pressure ; a., abscissa ; ?., time in one-second intervals. (From the British Medical Journal, Aug. Id, 1895.) although somewhat similar results are obtained with extracts of manyother organs (see pp. 9, 10). The fall of blood-pressure caused by thyroid extract is often precededby a slight rise. The fall is just as well marked after administration ofatropine as before : it is therefore not due to vagus action. 35 36
. The endocrine organs; an introduction to the study of internal secretion . at. FIG. 24.—Effect upon the blood-pressure of injecting thyroid extract intravenously. ftp., arterial pressure ; a., abscissa ; ?., time in one-second intervals. (From the British Medical Journal, Aug. Id, 1895.) although somewhat similar results are obtained with extracts of manyother organs (see pp. 9, 10). The fall of blood-pressure caused by thyroid extract is often precededby a slight rise. The fall is just as well marked after administration ofatropine as before : it is therefore not due to vagus action. 35 36 The Endocrine Organs Asher states that the fall of blood-pressure does not occur in the rabbit. I have,however, occasionally obtained it in that animal, but usually the fall is absent anda slight rise alone apparent. Asher and Flack found that the prior injection of thyroid extract in the rabbitincreases the excitability of the cardiac vagus and of the depressor. I have notbeen able to confirm this result either in the rabbit or in the cat or dog, although, inthe last two,
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