Natural Science

1. THE EXCRETORY
SYSTEM
Morad 5º Primaria
CRA. Entre dos Ríos - Aulas de Cabezuela -Segovia
Curso 2016-2017

2. THE EXCRETORY SYSTEM
The excretory system eliminates (or
excretes) waste products from our body.
Our body excretes carbon dioxide,urine
and water. The excretory system consists
of the urinary system and the sweat
glands.

3. THE URINARY SYSTEM
The urinary system is de principle way in which
the body gets rid of waste from blood.It
produces about 1.4 litres of urine every day.
1. The renal arteries carry blood to the kidneys.
2. The kidneys eliminate water and waste
products from the bood.This combination of
water and harmful subtances forms urine.
3. Urine leaves the kidneys and passes down
through two tubes called the ureters to the
bladder.
4. When the bladder is about half –full, it sends
signals to the brain that it needs to be
emptied.This is when you want to go to the
toilet!
5. The bladder is empied by onether tube called
the urethra.

4. SWEATING
Our body also eliminates waste
products through the skin.When we
get hot, sweat glands in our skin are
activate to cool down the body. These
glands excrete sweat which is a
mixture of water and minerals. Sweat
leaves our body through the pores.