. Animal hormones; a comparative survey. Hormones. 148 KINETIC HORMONES—II the hypophysis and the source of ACTH, the naturally induced secretion of ACH is only reduced to one half. Gonads stimulated by gonadotrophic hormones Morphogenetic hormones, secreted by the gonads, have a variety of effects related to reproduction, and have been reported from 500 400 cr> O O 300 < en 2 200 Saline. Histamine 30 Minutes 45 60 Fig. 4-11. Effects of injections of saline, epinephrine (adrenaline) and histamine on the ascorbic acid content of the adrenal cortex of rats, in mg/100 g gland (ordinat
. Animal hormones; a comparative survey. Hormones. 148 KINETIC HORMONES—II the hypophysis and the source of ACTH, the naturally induced secretion of ACH is only reduced to one half. Gonads stimulated by gonadotrophic hormones Morphogenetic hormones, secreted by the gonads, have a variety of effects related to reproduction, and have been reported from 500 400 cr> O O 300 < en 2 200 Saline. Histamine 30 Minutes 45 60 Fig. 4-11. Effects of injections of saline, epinephrine (adrenaline) and histamine on the ascorbic acid content of the adrenal cortex of rats, in mg/100 g gland (ordinates). The saline causes no change in 60 min (abscissae); the reduction due to adrenaline and histamine is by then the same, showing the two doses to be equivalent. The effect of histamine is much the more rapid, and must therefore evoke secretion of ACTH directly and not through any inter- mediary action of adrenaline (cf. Fig. 4-10, based on similar experiments). (From Munson and Briggs, 1955). many animals, including an unusually wide range of invertebrates as well as vertebrates. So far, it is only in the vertebrates that the secretion of these gonadial hormones is known to be controlled by endocrinokinetic hormones. Like the other hormones of this type in vertebrates these are all secreted from the adenohypophysis; they are often referred to as gonadotrophins, in common with. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jenkin, Penelope M. Oxford, New York, Pergamon Press
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