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pangeran
Baby girls are born with ovaries, fallopian tubes, and a uterus. The two
ovaries are oval-shaped and sit on either side of the uterus (womb) in the
lowest part of the abdomen called the pelvis. They contain thousands of eggs,
or ova. The two fallopian tubes are long and thin. Each fallopian tube
stretches from an ovary to the uterus, a pear-shaped organ that sits in the
middle of the pelvis. The muscles in a female's uterus are powerful and are
able to expand to allow the uterus to accommodate a growing fetus and then help
push the baby out during labor.
As a girl matures and enters puberty, the pituitary gland releases hormones
that stimulate the ovaries to produce other hormones called estrogen and
progesterone. These hormones have many effects on a girl's body, including
physical maturation, growth, and emotions.
About once a month, a tiny egg leaves one of the ovaries — a process called
ovulation — and travels down one of the fallopian tubes toward the uterus. In
the days before ovulation, the hormone estrogen stimulates the uterus to build
up its lining with extra blood and tissue, making the walls of the uterus thick
and cushioned. This happens to prepare the uterus for pregnancy: If the egg is
fertilized by a sperm cell, it travels to the uterus and attaches to the
cushiony wall of the uterus, where it slowly develops into a baby.
If the egg isn't fertilized, though — which is the case during most of a
woman's monthly cycles — it doesn't attach to the wall of the uterus. When this
happens, the uterus sheds the extra tissue lining. The blood, tissue, and
unfertilized egg leave the uterus, going through the vagina on the way out of
the body. This is a menstrual period.
This cycle happens almost every month for several more decades (except, of
course, when a female is pregnant) until a woman reaches menopause and no
longer releases eggs from her ovaries.
Posted in: For Girls
