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Episode 0255

Summary

This audio is a class lesson explaining the process of human conception. It covers female reproductive anatomy, ovulation, the number of eggs women are born with, male sperm production, the journey of sperm to fertilize an egg, and the initial stages of embryonic development and implantation in the uterus. The lesson includes questions and answers between a teacher and a student.

00:00 00:00

Transcript (Click timestamp to jump)

00:05 Speaker 1

Continuing with our class, today we are going to study briefly the miracle of life.

00:10 Speaker 1

Many of you may think you already know how babies come to be, but I'm sure that some of the things we will be talking about today may surprise you.

00:18 Speaker 1

Billy, can you turn on the projector please?

00:21 Speaker 1

Thanks.

00:22 Speaker 1

Okay, does anyone know what this is?

00:24 Speaker 2

Looks like a goat head to me.

00:27 Speaker 1

Nice try, but this is a woman's womb, which contains her uterus and ovaries.

00:33 Speaker 1

The ovaries are packed with eggs and each month during the middle of the menstrual cycle,

00:38 Speaker 2

This is one

00:38 Speaker 1

The ripest one will be sucked up by one of the fallopian tubes.

00:42 Speaker 1

This is called ovulation and the exact time of ovulation depends on the length of a woman's cycle.

00:48 Speaker 1

In an average 28-day cycle, ovulation will most likely happen between the 12th and 15th days.

00:55 Speaker 1

Counting day one as the first day of your last period.

00:59 Speaker 2

That's amazing. So each month the woman produces these eggs and then waits for them to be fertilized?

01:05 Speaker 1

Actually, every woman is already born with over 400,000 eggs.

01:11 Speaker 1

Some will start dying off immediately and others are released during her fertile period.

01:16 Speaker 2

What about the guys? I know they produce sperm and stuff.

01:20 Speaker 1

That's right. The man's body has a tiny factory that produces sperm 24 hours a day.

01:25 Speaker 1

Each ejaculation will release about 100 million sperm.

01:30 Speaker 1

So the factory is always pretty busy.

01:32 Speaker 1

The sole purpose of a sperm's life is to fertilize the woman's egg.

01:36 Speaker 2

So, then we basically need to put one and one together so we can have babies, right?

01:42 Speaker 1

Yes. The man will have an orgasm during intercourse and ejaculate sperm and semen.

01:47 Speaker 1

Now, this is where the race begins and all those millions of sperm will race and swim from the cervix through the uterus and to the fallopian tubes.

01:56 Speaker 1

This could take anywhere from 45 minutes to 12 hours.

02:00 Speaker 1

Not all of them make it, since some of them go the wrong way and get lost or simply die.

02:06 Speaker 1

Many will actually reach the egg but only one will penetrate it and fertilize it.

02:11 Speaker 1

Once this happens, the egg instantly changes and creates a protective shield once the sperm is safely inside.

02:18 Speaker 2

And then, that's it?

02:21 Speaker 1

Well, the egg will be fertilized within about 24 hours of its release.

02:25 Speaker 1

The genetic material from the sperm combines with the genetic material in the egg to create a new cell that will rapidly start dividing.

02:34 Speaker 1

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.

02:47 Speaker 1

Any other questions?

02:49 Speaker 1

Then let's move on.