1. The Respiratory System

2. Breathing
• the process of taking in air into our
bodies and giving it out again.
• is to take in oxygen which is used
for the process of respiration.
• also removes carbon dioxide
(produced during respiration) from
our bodies and releases it to the air.

3. The parts of a living thing that help it to
breathe form the respiratory system.
Different living things have different parts
in their respiratory systems.
Living Things Respiratory Systems
Fish Gills
Amphibian Lungs, Skin or Gills
Plants Stomata
Worms Moist Skin

4. Respiratory in Human Body

6. When you
breathe in, your
ribs move out and
upwards. Your
diaphragm, a thin
sheet of muscle
moves
downwards. This
causes your chest
to become bigger.

7. When you breathe
out, your ribs move in
and downwards. This
time, your diaphragm
moves upwards. This
causes your chest to
become smaller and
the air that has
carbon dioxide in it, is
forced out of your
lungs.

8. This is how the
lungs expand
itself when the
air enters or
exits from it.

9. Respiration in
Human Body
When you breathe in,
• Air enters into
the your body
through your
nose or your
mouth.
• Air is cleaned,
warmed and

10. Respiration in
Human Body
When you breathe in,
• Air then moves
into the windpipe.
• The windpipe
has tiny hair that
traps dust
particles found in
the air.

11. Respiration in
Human Body
When you breathe in,
• Air enters the left
and right into 2
smaller tubes.
• Tubes branch
further into tiny
tubes that end in
balloon-like air sacs.

13. An Alveoli –
Air Sac
Air Sac When the air you
breathe in
Blood reaches your air
Vessel sacs, oxygen
passes through
the walls of the
sacs into the
blood vessels.

15. The blood then
carries the oxygen
to all parts of your
body.

16. An Alveoli –
Air Sac
At the same time,
Air Sac
carbon dioxide from
Blood the blood passes
Vessel through your blood
vessel into the air
sacs. Carbon
dioxide mixes with
the air in your air
sacs.