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| We have seen why the different methods of birth control do work, but there are still some myths around about other methods that 'work'. Before we look at these mythical methods, let's see how pregnancy does happen. The Myths won't be around in your mind very long after viewing this page. | ||||||||||||||||
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Ovulation,
which only takes about two minutes to complete, usually occurs 14 days
after the onset of the period in a 28 day cycle. Ovulation always
occurs 14 days BEFORE the onset of your period.The egg is capable of being
fertilized for 24 hours. If fertilization doesn't occur, the egg
dies. A small amount of bleeding can occur with the rupture of the
follicle.
Women ovulate approximately 400 times from puberty to menopause. All the eggs not ovulated by menopause have died. Ovaries also do not necessarily take turns in releasing eggs. If one ovary is surgically removed, the remaining ovary will produce an egg a month. |
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The
testes is where sperm are formed. The new sperm travel through the
epididymis, behind each testis, where they mature. The mature sperm
travel through a tube called the vas deferens through the seminal vesicle,
a sac near the bladder. In the seminal vesicle, semen is added.
The semen-sperm mixture (ejaculate) passes through the prostate and
joins the urethra. The ejaculate travels through the urethra (the
tube that carries urine from the bladder to the end of the penis), and
is discharged.
Contrary to women, who usually produce only one egg a month, men are capable of producing billions of sperm. Even though the numbers can decrease after the age of forty, men are capable of producing sperm from puberty well into life. Men can be fathers in their eighties and nineties. Sperm can live in the vagina, cervix, uterus and fallopian tubes for up to five days. Only a few hundred of the 250 million healthy sperm reach the egg. It takes about two hours to make the entire journey to the egg; however, some sperm are Olympic swimmers and can reach the egg in a half an hour. If no egg is available to fertilize, the sperm swim around patiently waiting to bump into one. Because there is no chemical or physical attraction of the sperm for the egg, the sperm literally must bump into the egg. |
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Before
ovulation occurs, the fimbria (finger-like ends) of the fallopian tube
are positioned over the ovary (see above illustration). These fimbria
move along the ovary until a follicle containing the ripened egg is found.
The lining of a fallopian tube contains millions of hairlike projections,
called cilia, that move back and forth creating suction. When ovulation
occurs this suction sweeps up the egg, along with some of the fluid that
has surrounded the egg in the follicle. The chemicals in the fluid
signal the muscles of the fallopian tube to contract. These contractions
propel the egg gently toward the uterus. After the egg is in the
fallopian tube, it continues to ripen and prepare itself for the sperm.
The egg is surrounded by a nourishing shell which the sperm must penetrate.
Each of the hundreds of sperm work hard to penetrate the shell, layer by
layer. Suddenly, one sperm breaks through the shell and instantly
a chemical reaction takes place, making it impossible for any other sperm
to penetrate. The area of the egg containing the mother's genetic
contribution (chromosomes) and the area of the sperm containing dad's genetic
contribution combine to begin a brand- new, unique individual. About
24 hours after fertilization, the first division of the newly formed cell
takes place. The dividing ball of cells continues to travel down
the fallopian tube toward the uterus where it will implant and grow.
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Excerpts and illustrations are taken from The Family Pregnancy |