Abstract
Conclusions
During inhalation of 7-9% oxygen the pressor reflexes of the carotid sinus are greatly reduced. This is shown, (1) by a greater fall of blood pressure in the carotid artery upon changing from the horizontal to the vertical (feet down) position than is obtained under control conditions before and after the administration of low oxygen; (2) by a diminished response of the blood pressure under low oxygen to a given increase in pressure in the carotid sinus.
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