[Hormonal regulation of calcium metabolism and regulation of hormone secretion by Ca2+].

In a short review the spectacular discoveries in the field of the Ca-homeostasis are delineated. To begin with, the structure and function of parathyroid hormone and of calcitonin are described, whereas the influence of the tocolytica, the catecholamines and glucagon are only touched. Other short chapters deal with the energetic processes during Ca2+ efflux and influx as well as the intracellulare Ca2+-homeostasis. In greater detail the metabolic changes of vitamin D3 and of 1,25 (OH2) D3 in the human organism are described and the action of the latter-hormone in the entire Ca-metabolism is reviewed. With the model of insulin the decisive importance of ca2+ for release of different hormones is demonstrated.