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From Boy to Man:
Male Reproduction
When a baby boy is born, he has all the parts of his
reproductive system in place, but it isn't until puberty that
he is able to reproduce.
Scrotum

Controls temperature of
testicles
Testicles

Also called testes

Produce millions of
tiny sperm cells and
sex hormones
Sperm Cell

Males produce
millions of sperm cells
every day

Each sperm is 1/600
of an inch.
Testosterone

Produced in testes

Male sex hormone

Small amounts found
in females
Knowledge Check
Q1: What structure regulates the temperature of
the testes?
A: scrotum
Q2: Where are sperm and hormones made?
A: testicles
Q3: What is the male sex hormone?
A: testosterone
Urethra

passageway for both
urine and semen

Semen is a mix of
fluids that help sperm
swim

A male cannot urinate
and ejaculate at the
same time
Penis

Functions in urination, sex and reproduction
Foreskin
The fold of skin at the end of the penis covering
the glans, or the head of the penis.
Knowledge Check
Q4: What are the functions of the penis?
A: urination, sex and reproduction
Q5: What is the name of the skin that covers the tip
of the penis?
A: foreskin
Q6: What is the mixture of sperm cells and fluids?
A: semen
Q7: What is the passageway for semen and urine?
A: urethra
Circumcision

The removal of the foreskin from the penis
 Performed for religious, hygienic, or cultural
reasons.
Erection

Penis is made of spongy
erectile tissue that
expands and contracts

Erection occurs penis fills
with blood and becomes
stiff and hard
Ejaculation

Muscles around the
reproductive organs
contract and semen is
released from body

Also known as an
orgasm
Each time a male ejaculates, it can contain up to 500
million sperm.
Knowledge Check
Q8: What term describes when the penis fills
with blood and gets longer and harder?
A: erection
Q9: What term describes the removal of
foreskin?
A: circumcision
Q10: What is another term for ejaculation?
A: orgasm
Identify the Parts
Q11
Q12
Q13