During Menstruation. The uterine lining sheds to prepare the uterus for pregnancy. It's due to the drop in estrogen and progesterone.
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The uterine lining builds-up following ovulation in preparation for possible pregnancy, to allow the zygote to implant and nourish the growing 'baby'. If pregnancy doesn't occur the drop in progesterone triggers the uterus lining to break down, this is called menstruation.
Yes, thickening of the uterine lining is one of the main functions of progesterone during the menstrual cycle, allowing the womb to build-up the uterine lining to support a fertilised egg. If pregnancy doesn't occur then it's the drop in progesterone that causes the uterine lining to break down.
Your period is the breakdown of the uterine lining. Once a pregnancy is established by the embryo implanting in the uterine lining, the hormone hCG and progesterone kick in to prevent the breakdown. While pregnant the lining does not break down because it is being used to support the placenta and fetus.
ovarian cycle is the cycle of ovary developed from follicles to yellow bodies, uterine lining is the cycle of building up and breaking down of the uterine lining(menstruation).
Breaks down
breaks down
The uterine lining builds-up in preparation for fertilization so that the zygote/embryo can implant itself into the uterine lining and then develop into a baby. Menstruation only takes place when fertilization doesn't take place, this occurs so the uterine lining is shed and can start a fresh next cycle so it can be ready for pregnancy again. If the uterine lining were to break down after fertilization a zygote/embryo wouldn't be able to implant itself or it would result in miscarriage.
Menstruation is caused by the break-down of the lining of the womb. This happens when no egg implants. Once an eggs is fertilised it attaches to the womb's lining, so the lining does not break down.
Progesterone doesn't start your period, it's actually the drop in progesterone that starts your period. Progesterone caused the uterus lining to build up, if pregnancy doesn't occur the progesterone level drops causing the uterine lining to break down - menstruation.
Menstruation is the process through which the uterine lining is shed.If pregnancy doesn't occur the drop in progesterone causes the uterine lining to break-down, tissue and blood leave the uterus and exit the body via the vagina - this is menstruation or a period. Some women will also experience a withdrawal bleeding while using hormonal birth control which is similar to menstruation but there is less uterine tissue lost so can be lighter.
because the egg is not needed so the lining of the stomach is not needed to protect the egg. The lining breaks down and this is a period.