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The Respiratory
System
What is breathing?
 Refers
to the movement of
air into and out of your
lungs
The two main functions of the
respiratory system are:

1: Moves oxygen from the outside
environment into the body

2: Removes CO2 and H2O from the body
What are alveoli? Where are they
found?

Alveoli are air sacs
found at the ends of
the bronchioles
Gas exchange occurs
 here

The Pathway of Air
Each step of the respiratory system:

1: NOSE – blood vessels warm the air

Mucus & hair (cilia) trap particles to
prevent them from going into the lungs
Next……

2: PHARYNX – back of the throat,
shared with the digestive system
And then….

3: TRACHEA –
windpipe, tube with a
series of ridges lined
with cilia and mucus
Just a few more steps….

4: BRONCHI
(lungs) – directs air
into the lungs (main
organs of the
respiratory system),
branch into smaller
and smaller
bronchioles
And finally…..

5: ALVEOLI – “grapes” or air sacs at the
ends of the bronchioles, CO2 and O2 are
exchanged here through the capillaries
The gas exchange:
What is exchanged inside the
lungs? How does this exchange
occur?

Air enters the alveoli, oxygen passes
through the wall of the alveoli and then
through the capillary walls into the RBC.
Carbon dioxide passes through the
capillary walls, through the alveoli walls
and is breathed out
Gas Exchange in Detail…..
What is Cellular Respiration?

A chemical reaction inside cells

O2 + glucose
Energy + CO2 + H2O
Do you know why we_____?

Sneeze: http://kidshealth.org/kid/talk/qa/sneeze.html

Yawning: http://kidshealth.org/kid/talk/qa/yawn.html

Coughing: http://kidshealth.org/kid/word/c/cough.html

Hiccup: http://kidshealth.org/kid/talk/qa/hiccup.html
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