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Menstrual Cycle. Michal Ovecka. Introduction. Unlike some animals, Humans can reproduce during any time of the year In the females this involves the menstrual cycle - production of an oocyte inside the follice Thickening of the lining of the uterus - PowerPoint PPT Presentation
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Menstrual CycleMichal Ovecka
Introduction Unlike some animals, Humans can reproduce during any time of the year
In the females this involves the menstrual cycle - production of an oocyte inside the follice
Thickening of the lining of the uterus When no embryo is formed, the thickening is broken down and passed out of the body during menstruation
Phases of the Menstrual cycle Follicular phase Ovulation Luteal phase Menstruation
Follicular phase Pituitary gland secretes FSH
Follicular phase Stimulating a group of follicles, the containing eggs and estrogen secretion by cells of the follicles
While the eggs are going through development the lining of the uterus (endometrium) begins to repair, due to increasing levels of estrogen
Estrogen levels reach a peak, thus stimulating LH secretion by the pituitary gland
Ovulation LH rises to a peak causing the most developed follicle to release an egg into the oviduct (the other follicles degenerate)
LH causes the follicle cells to secrete less estrogen and more progesterone.
The LH causes the follicle which released the egg to develop into corpus luteum.
The corpus luteum secretes progesterone which develops the endometrium
The development of the endometrium prepares the egg for the implantation of an embryo
Menstruation High levels of progesterone and estrogen levels inhibit FSH and LH secretion
If fertilization does not occur, the corpus luteum degenerates and the lining of the uterus breaks down - for shedding during menstruation
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Bibliography http://upload.wikimedia.org/wikipedia/commons/a/a5/Hypophyse.png
http://www.ux1.eiu.edu/~cfjcd/Menstrual_Cycle.pdf
https://www.theeveningjava.com/images/femalerepro..jpg
Allot, Andrew. IB Study Guides Biology. Second ed. Glasgow: Oxford UP, 2007. Print.
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