through all of the topics in the lesson guide, then continue
to the activity and posttest.
Respiratory System is the group of organs in the body that is responsible
Try taking a breath. When you inhale, you are pulling fresh, oxygen
containing air into your lungs to be absorbed. Now breathe out.
When you exhale, you push the stale
air containing carbon dioxide (CO2)
out of your lungs.
if air pollution is present in the air you breathe, it too can enter
the respiratory system with every breath. The
major harmful effects to human health from air pollution occur in
the lungs. Children
are particularly susceptible to environmental pollutants that enter
the respiratory system and eventually reach
the lungs for several reasons:
tend to spend more time engaging in physical activities outdoors
than do adults.
breathe through their mouths more often than adults, thus bypassing
the filtering and removal of air pollutants that occurs
by breathing through the nasal passages.
air passages are smaller than adults. Irritation caused
by air pollutants can cause air passages to swell. Since their
air passages are smaller, it is more difficult for children breathe
with partially blocked air passages.
this lesson to find out more about specific types of air pollutants.