. Embryology. Embryology; Embryology; genealogy. HUMAN PREGNANCY TESTS 23 Pituitary secretion LH(ICSH) growth of corpu luteum degeneration of corpus luteum. FSH growth of follicle- rupture of follicle (ovulation) estrone liberated into blood stream this is another story (see Chap. 18). Whatever the exact relationship, there is certainly a reciprocal relationship between the pituitary and the ovary, each exerting a control over the other to form a rhythmic cycle. Human pregnancy tests These studies on the control of ovulation have resulted in some practical applications. In the first place, we
. Embryology. Embryology; Embryology; genealogy. HUMAN PREGNANCY TESTS 23 Pituitary secretion LH(ICSH) growth of corpu luteum degeneration of corpus luteum. FSH growth of follicle- rupture of follicle (ovulation) estrone liberated into blood stream this is another story (see Chap. 18). Whatever the exact relationship, there is certainly a reciprocal relationship between the pituitary and the ovary, each exerting a control over the other to form a rhythmic cycle. Human pregnancy tests These studies on the control of ovulation have resulted in some practical applications. In the first place, we find that hormones other than those of the pituitary will stimulate the ovaries and that some of these substances will cause ovulation. And in particular, during early human pregnancy, a hormone appears in the urine which, when injected into immature mice, will stimulate the ovaries of the mice to mature. This gonadotropic hormone has been traced to the chorion formed by the developing embryo. The injection of urine into an immature animal thus becomes a test for pregnancy and, in its original form, is known as the Aschheim-Zondek test. There is a modification of the test in which rabbits are used; this is called the Friedman test. Since a reaction to gonadotropic hormones is a general one, other animals may be used for testing pregnancy. Some biologists have attempted to use the South African frog, which lays its eggs when exposed to pregnancy urine. Male frogs also react by releasing sperm. There have also been some tests devised in which fish are used; indeed any number of animals could be em- ployed to test for the presence of this pregnancy hormone. Because the human. 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 Barth, Lester G. (Lester George), 1905-1979. New York, Dryden Press
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