3. 2. PARTS OF THE EXCRETORY SYSTEM:
2.1 SWEAT GLANDS 2.2 THE URINARY TRACT
You have got millions of tiny sweat
glands in your skin. They produce
sweat- a liquid that contains water,
waste products and mineral salts.
The main parts of the urinary tract are:
They are two bean-
shaped organs that are
next to your spinal
column. They filter
your blood to remove
waste. Then they mix
the waste with the
water to produce urine.
Every day, your kidneys
filter about 1,500 litres
of blood.
They are two thin tubes
that carrie urine from
your kidneys to your
bladder.
It is a bag-shaped
organ with muscular
walls. It stores the
urine until you go to
the toilet.
It carrries the urine out of your
body when you go to the toilet.
4. 2.2.3 HOW DOES THE URINARY TRACT WORK?
The urinary tract filters your blood to remove waste products and harmful
substances. Then the organs eliminate these substances from your body.
The renal arteries carry blood to the kidneys.
The waste and other substances dissolved in
water form urine.
The ureters carry the urine to the bladder,
where it is stored.
When the bladder is full, it contracts and
pushes the urine out of the body through the
urethra.
