Menstruation phase | Follicular phase | Luteal phase | |
(1) | Regeneration of endometrium | High level of progesterone | Developing corpus luteum |
(2) | Matured follicle | Regression of corpus luteum | Ovulation |
(3) | Menses | Developing corpus luteum | Follicle maturation |
(4) | Menses | L.H. Surge | Regeneration of endometrium |
List I | List II | ||
---|---|---|---|
A | Mesozoic Era | I | Lower invertebrates |
B | Proterozoic Era | II | Fish & Amphibia |
C | Cenozoic Era | III | Birds & Reptiles |
D | Paleozoic Era | IV | Mammals |
Menstrual cycle is the monthly series of changes a woman's body goes through while having a possibility of pregnancy. Each month one egg is released by the and this process is called ovulation. If ovulation takes place and the egg isn't fertilized, the lining of the uterus sheds through the vagina. This is a menstrual period.
Menstrual cycle irregularities can have many different causes, including: