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1 Department of Physiology, Long Island College of Medicine, Brooklyn, N. Y.
1. The effects of estrogen upon different parts of the peripheral systemic circulation are reviewed and the fact noted that this hormone exhibits a characteristic action upon the blood vessels of the skin and nasal mucosa in women. This consists of dilatation of the smallest vessels, with decrease in capillary blood pressure and no increase in the rate of blood-flow through these vessels.
2. Estrogen has no discernible effect upon the heart or mean level of arterial blood pressure in the rabbit, dog and human.
3. In this work, the effect of estrogen upon the blood vessels in the ear of ovariectomized rabbits is established. This hormone causes dilatation of the minute (capillaries and venules) vessels. The rate of blood-flow through the ear varies, not with the degree of vasodilatation brought about by the estrogen, but by the requirements for heat-loss which dilatation of the smallest vessels imposes in the regulation of normal body temperature under different experimental conditions.
Submitted on September 3, 1939
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