What is the inner layer of the uterus mainly involved in during menstruation?
That layer is called as endometrium. It sheds away during the menstruation.
The inflammatory substance responsible for pain during menstruation is prostaglandins. The prostaglandins cause the uterine contractions, but in high quantities it will cause blood vessels supplying the uterus with blood to construct so starve the uterus of blood/oxygen very temporarily, and thus this is what causes the pain during menstruation.
The layer of the uterus that is shed during menstruation, approximately every 28 days, is the endometrium - this is the spongy mucosal tissue that develops after ovulation under the influence of progesterone to support the fertilised egg should a woman fall pregnant, if the woman doesn't fall pregnant then the endometruim becomes unstable and sheds aka menstruation.
Menstruation is one of the phases of the menstrual cycle, whereas the menstrual cycle is the entire reproductive system. During the menstrual cycle an egg is released and to prepare for possible pregnancy the uterus lining plumps-up, if pregnancy doesn't occur the uterus lining sheds (menstruation) so it can start afresh again next cycle.
Menstruation occurs because of a drop in the level of the hormone progesterone. Once an egg has been fertilized the level of progesterone stays high and does not drop unless the fetus is spontaneously aborted. The high progesterone level keeps the woman pregnant and keeps the lining of her uterus intact and not shedding as it would during menstruation. If a woman did have a full menstruation while pregnant the fetus would be aborted because…
When menstruation happens, it develop an egg cell and carried out with the lining of the uterus called the endumetrium because it dies. If a serm cell enter on it it start to secretes the covering that prevents other spem cells enter. During that, menstruation stops because the blood came from the uterus protect it and give nourish to the fertilized egg. It usually happen because a sperm cell meet it
If you bleed during pregnancy it's not menstruation. It can sometimes seem like it but it's not. And it's usually lighter. If you are menstruating however you can not be pregnant. You menstruate because the uterus is shedding the lining since no egg is fertilized and attached to it. When pregnant you do not release eggs and the uterus can not shed the lining since then you would have a miscarriage.
This is just your body preparing for menstruation. Menstruation is triggered by the drop in progesterone, as the levels of progesterone drop the uterus starts to shed - starting with very light bleeding, that then gets heavier as the levels of progesterone continue to drop. Spotting is normal during menstruation.
No, but you can get pregnant as a result of sex on your period. Pregnancy occurs when an egg is ovulated, it then travels to the uterus and implants itself. During menstruation you don't ovulate, even if you did it would take time for a fertilized egg to travel to the uterus and it couldn't implant during menstruation due to the uterine lining shedding. You can be fertile during your period, meaning that you may…