Zoology - Human Reproduction Question with Solution | TestHub
Which hormone maintains progesterone and estrogen secretion by the corpus luteum through the first trimester of pregnancy?
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After fertilization, the zygote undergoes a series of development and thus forms embryo. This embryo then gets implanted in the uterus at around the eighth day after fertilization and this marks the beginning of pregnancy. It is the blastula that gets implanted. The pregnancy can also be confirmed through blood or urine tests as hormone hCG (Human chorionic gonadotropin) begins to increase in blood and urine. This hormone begins to increase from the 8th day and remains in the blood till the parturition. Human chorionic gonadotrophin is the embryonic hormone that ensures the corpus luteum continues to produce progesterone throughout the first trimester of pregnancy. This hormone initially is released by trophoblast and then by placenta.
