You've sort of answered this question twice in the question itself!
"The PERIOD in the MENSTRUAL cycle which the...in the MENSTRUAL"
The menstrual phase aka menstruation or period.
At the beginning of the menstrual period.
It is controlled by the uterus. That is where the uterus lining is which causes the menstrual cycle
The uterus has a lining of blood in it. When the unfertilized egg passes through the uterus it sheds this lining which causes the blood to come out.
The blood lining of the uterus gradually thickens during a woman's menstrual cycle in order to be prepared to receive the fertilized egg. This lining will shed during the menstrual period if no fertilized egg has implanted.
if it is fertilized by sperm it becomes a zygote that embeds itself into the lining on uterus The placenta, which is especially prepared for this event once a month if it is not fertilized it breaks down after a couple of days which signals for the uterus to dispose of the lining in what is seen as menstrual bleeding.
If sperm does not fertilize an egg that is released from the fallopian tubes each month, the uterus sheds its inner lining each month which is known as the menstrual period.
Ovaries produce eggs which travel to the uterus. There they will either get fertilized by sperm or the the uterus will shed its lining, which causes a period.
Yes. Your uterus is still shedding it's lining, menstruation stage of the menstrual cycle can continue after your period.
because a boy does not have a uterus! the lining of the uterus is renewed every couple of weeks hence the flow (called a period).
A menstrual period is when the uterus lining sheds as a result of a cycle without pregnancy occurring. Menstrual flow is made up of the uterine tissue, blood, cervical mucus, and discharge.
During a woman's menstrual cycle, she will begin to ovulate. During ovulation, the ovary releases an egg. If the egg is not fertilized, it will continue to make its way down into the uterus. The uterus will begin to shed its lining since it is not needed. The lining of the uterus and the egg will be expelled from the vagina. This step of the menstrual cycle is what is refered to as the period.
One is the muscle, also called the myometrium. This is the wall of the uterus; and is where fibroids grow. The more important part is the endometrium. This is the inner lining of the uterus. It is this lining which is shed during the menstrual period; and it is in this lining that the embryo implants.