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From The Menstral Cycle To Birth - College Term Papers

From The Menstral Cycle To Birth

The Hypothalamus releases the gonadotropin-releasing hormone(GnRH). This hormone actives the pituitary gland to release the follicle-stimulating hormone(FSH) and the luteining hormone(LH). FSH is carried by the blood to the ovaries, where the follicle development is stimulated. The follicles secretes estrogen which initiates the mormation of the endometrium. As the estrogen level rises negative feedback shuts down the production of FSH and at the same time a messege is sent to the pituitary gland to secrete LH. As the level of Lh increases ovulation occurs. After ovulation the remaining follicle cells transform into the corpus luteum. The corpus luteum secreetes estrogen and progesterone ...

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produces a hormone(HCG) to maintain the corpus luteum for the first 3 months of pregnancy so it can provide high levels of estrogen and progesterone. After the third month the placenta provides enough estrogen and progesterone to maintain the endometrium and also to inhibit further ovulation. Conception is when the egg and the sperm meet in the oviduct to form the zygote. If the egg or the sperm have any chromosome abnormalities the baby could be born abnormal. The zygote cell starts the divide and by the sixth day enters the uterus. If the embryo starts to develop in the oviduct instead, it would parish from lack of nutrients. Once in the uterus this cluster of cells becomes the blastocyst. It attaches itself to the endometrium. This process is known as implantation. The amnion, which is a fluid filled sac, develops to protect the embryo from infection, dehydration and impact. Cells of the endometrium and embryo combine to form the placenta. The placenta is attached to the mother's ...

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PAPER DETAILS

Added: 3/16/2006 01:12:40 AM
Category: Health & Medicine
Type: Premium Paper
Words: 478
Pages: 2

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