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Abstract
The influence of seyeral hormonal factors on calcium, endogenous excretion was studied in adult rats. The injection of parathyroid hormone doesn't change the fecal endogenous calcium. It may be that the parathyroid hormone have a real effect over the intestinal absortion of calcium, effect, that in our experiments, would be masked by an increase in the calcitonine secretion. In the kidney, the parathyroid hormone causes an increase, of endogenous caldum excretion highly significative, which it would be possible the result of the raising of the calcemia. The administration of calcitonine or thyroxine produces an increase in the fecal and urinary excretion of endogenous calcium. Possibly, the calcitonine produces hypercalciurie and hypocalcemia acting directly upon the kidney and inhibiting the tubular reabsorption of calcium.
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