The Urinary System
and the Genitals
233
CHAPTER
18
The urinary system or tract serves the body by removing waste material from
the blood and getting rid of it in the form of urine:
The kidneys
filter the
blood and
form the
urine.
The ureters
are tubes
that carry
urine to the
bladder.
The genitals are the sex organs.
The bladder is a bag that stores the
urine. As it fills, it stretches and gets
bigger.
The urine tube
or urinary canal
(urethra) carries
urine out through
the penis in men or
to a small opening
between the lips of
the vagina in women.
The man:
bladder
sperm tube
urine canal
penis or
male sex
organ
scrotum or
sac that holds
the testicles
The prostate gland makes the
liquid that carries the sperm.
The testicles make the
sperm, or microscopic
cells with tails that join
with the egg of a woman
and make her pregnant.
The woman:
outer lips
of the
vagina
inner lips
anus: end of
the intestine
clitoris: a very sensitive
spot that can give
sexual pleasure when
touched
urinary opening: hole
where urine comes out
opening to the vagina or
birth canal. (For inside
view, see p. 280.)