2. Review
• What are the main organs of the respiratory
system?
– Nasal cavity
– Pharynx
– Larynx
– Trachea
– Bronchi
– Lungs
• We will focus on the processes in and around the
lungs
3. Review of how air moves in your body
• Air enters the nose or mouth and travels down
the:
– pharynx, larynx, trachea and down the bronchi
• The bronchi branch to form bronchioles
• At the end of bronchioles are the alveoli (air
sacs) where gas exchange occurs
– What gases are exchanged here?
– Oxygen and carbon dioxide!
4. Process of Breathing
• Diaphragm is a muscle
under your lungs and
helps move air in and out
of the body
• Breathe in = the
diaphragm contracts and
moves down to allow air
to move into lungs
• Breathe out = opposite
– Diaphragm relaxes to
return to the normal shape
– Gases are pushed out
5. Health problems
related to breathing
• Bronchitis
– Bronchial tubes are
irritated and too much
mucus is produced
– Can’t move waste out of
lungs
• Emphysema
– Alveoli cannot expand and
contract
– Mostly related to smoking
• Asthma
– Reaction that causes a
person to have trouble
breathing, cough
– Treated by inhaling drugs
