A: Continuing with our class, today we are going to
study briefly the miracle of life. Many of you may
think you already know how babies come to be,
but I am sure that some of the things that we will
be talking about today may surprise you. Billy can
you turn on the projector please? Thanks. Ok,
does anyone know what this is?
B: Looks like a goat head to me!
A: Nice try, but this is a woman’s womb which contains her uterus and ovaries. The ovaries. are
packed with eggs and each month during the middle of the menstrual cycle, the ripest one will be
sucked up by one of the fallopian tubes. This is
called ovulation and the exact time of ovulation
depends on the length of your cycle. In an average 28 day cycle, ovulation will most likely happen
between the 12th and 15th days, counting day 1
as the first day of your last period.
B: That’s amazing! So each month, the woman produces these eggs and then waits for them to be
fertilized?
A: Actually, every woman is already born with over
four hundred thousand eggs! Some will start dying off immediately and others released during
her fertile period.
B: What about the guys? I know they produce sperm
and stuff.
A: That’s right! The man’s body has a tiny factory
that produces sperm twenty four hours a day!
Each ejaculation will release about a hundred million sperm so the factory is always pretty busy.
The sole purpose of a sperm’s life is to fertilize
the woman’s egg.
B: So, then we basically need to put one-and-one
together so we can have babies right?
A: Yes, the man will have an orgasm during intercourse and ejaculate sperm and semen. Now this
is where the race begins and all those millions of
sperm will race and swim from the cervix, through
the uterus to the fallopian tubes. This could take
anywhere from forty five minutes to twelve hours!
Not all of them make it, since some go the wrong
way and get lost or simply die. Many will actually
reach the egg but only one will penetrate it and
fertilize it. Once this happens, the egg instantly
changes and creates a protective shield once the
sperm is safely inside.
B: And then? That’s it?
A: Well, the egg will be fertilized within about 24
hours of its release. The genetic material from
the sperm combines with the genetic material in
the egg to create a new cell that will rapidly start
dividing. The woman is not actually pregnant until that bundle of new cells, known as the embryo,
travels the rest of the way down the fallopian tube
and attaches itself to the wall of her uterus. Any
other questions? Then let’s move on.