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Menstruation is part of the menstrual cycle and occurs when there is a discharge of blood
from the uterus through the vagina. This vaginal discharge includes tissue from the
endometrium, blood, and the ovum. This occurs once a month. The first day of
menstruation marks day 1 of the menstrual cycle. The menstruation period happens when
the uterine lining or endometrium is shed as blood. This is what girls experience during
their monthly period, which usually lasts for 3–5 days.
Preparation of the Ovum
After the uterine lining is shed, the preparation of the egg follows. During days 6–13, the
uterine lining, which has been shed, repairs itself while the egg in the ovaries matures. The
uterine lining begins to thicken to prepare for possible fertilization and pregnancy.
Meanwhile, a follicle containing an immature egg begins to grow in the ovaries.
Ovulation
On day 14, the ovary releases a mature egg cell to the uterus. The release of an egg from
the ovary is called ovulation. The mature egg is now ready for fertilization and moves into
the fallopian tube. The uterus is where the zygote is implanted. This is the reason why
during this stage, the uterus continues to thicken in preparation for fertilization and
pregnancy. If no fertilization takes place until day 28, the uterine lining will start to break
and shed. The moment that menstruation begins also marks the new menstrual cycle.
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