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What specific structure produces progesterone in females?  How does the anatomy/histology of the uterus change with high...

What specific structure produces progesterone in females?  How does the anatomy/histology of the uterus change with high levels of progesterone?  How does the presence vs. non-presence of chorionic gonadotropin influence progesterone levels and why does this happen?

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ANSWER: Progesterone is secreted by corpus leutum of the ovary during the second half of the menstrual cycle. The main function of progesterone is to thicken the lining of uterus mainly in the endometrial part and makes it ready to catch hold the fertilized egg. If pregnancy occurs the fertilized egg will be caught in the enriched part prepared by the hormone progesterone and the hormone secretion will be taken over by placenta and its level will be elevated throughout the pregnancy. Chorionic gonadotropin hormone presence will be ensuring corpus leutum to continuously secrete progesterone throughout the first trimester. If this hormone is not secreted then pregnancy will not be maintained.

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