2. Male Reproductive System

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Boys have different sex organs than girls

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In boys, the sex organs are 2 testes

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Vocabulary:

testes

Male sex organs that produce hormones and sperm

The testes are on the outside of the male’s body

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They are in a sac of skin called the scrotum

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Vocabulary:

scrotum

A sac of skin that holds the testes in males

Sex organs work as glands and make

hormones

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During puberty, they make a boy’s body change to look more like a man’s

body

They are also important in reproduction

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That is why sex organs are part of the reproductive system

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Vocabulary:

Reproductive system

The body system in which sperm cells or egg cells are made

Testes make cells called sperm

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Vocabulary:

sperm

The male reproductive cells made in the testes

Sperm are so small you need a microscope to see them

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Males begin making sperm when the reach puberty and hundreds of millions

are made in a lifetime

Millions of sperm leave the testes and pass along a long, thin tube

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The sperm will mix with fluid to make semen

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Vocabulary:

semen

A mixture of a fluid and sperm cells

The semen passes into another tube under the bladder

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This tube, the urethra, is in the penis and leads semen out of the body

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Vocabulary:

urethra

A tube that leads semen and urine out of the male’s body

A sperm cell must come together with an egg cell from a female

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for a baby to form

First, sperm has a long, threadlike tail that moves back and forth

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Which helps push the sperm along to swim to the egg cell

If a sperm meets an egg, they can join

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Only one sperm cell can be used for fertilization of an egg cell

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Vocabulary:

fertilization

When a sperm cell joins with an egg cell

The fertilized egg, called zygotes, begins to grow and divide

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It forms 2 cells

Then the 2 cells divide and form 4 cells and so on to form an embryo

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In about 9 months a new human life begins that is called a baby