2. THE RESPIRATORY SYSTEM
The respiratory system
is made up of the
respiratory tract and the
lungs.
The respiratory trac
connects the nose and
the mouth to the lungs
and consists of the
nostrils,the pharynx,the
larynx,the trachea and
the bronchi.
3. MOVEMENT OF THE LUNGS
Air enters the lungs
every time we
breathe in.This is
know as inhalation.
Exhalation is the
movement of air
out of the lungs we
breathe out.
4. HEALTHY BREATHING
To avoid diseases of
the respiratory tract,
the air we breathe
must be clean.
Here are some
practical tips to keep
your lung health:
-Avoid places that are
not well ventilated.-
-Do physical exercise.
-Avoid pollution.
5. EXCRETION
The excretory
system removes
waste products
from our cells in a
process called
excretion.The most
important excretory
organs are the
kidneys,which are
part of the urinary
tract.
6. THIRST
Our kidneys regulate
the amount of water
and salts in our body
and removes what we
do not need. We
should drink all the
water our body asks
for,especially when
do physicalb exercise
or the weather is hot,
because we sweat
more our body needs
to replace the liquid
lost.
