1. Take a deep breath and relax
Respiratory System
Take a deep breath and relax

2. Structure
Nose
Pharynx
Larynx
Trachea
Bronchi
Alveoli
Lungs

3. Nose/Mouth
When the air comes into your nose it gets filtered by tiny hairs and it is moistened by the mucus that is in your nose
Your sinuses also help out with your Respiratory System. They help to moisten and heat the air that you breathe.
Air can also get into your body through your mouth/oral cavity but air is not filtered as much when it enters in through your mouth (We take in more air here)

4. Nose/Mouth Picture

5. Pharynx/Trachea Your pharynx (throat) gathers air after it passes
through your nose and then the air is passed down to
your trachea (windpipe).
Your trachea is held open by “incomplete rings of cartilage.” Without these rings your trachea might close off and air would not be able to get to and from your lungs.
Pharynx
(Throat)
Mouth
Trachea

6. Bronchi (singular bronchus)- left and right transport the air you breathe
Bronchioles- smaller divisions of the bronchi
Bronchioles end in small air sacs called alveoli

7. Alveoli – tiny air sacs that exchange oxygen and carbon dioxide.
Capillary
Capillary wall
Carbon Dioxide is dropped off
Oxygen is picked up
Red Blood Cell

8. Lungs
Lungs: 2 unequal lobes
Covered in a membrane called the pleura
Have many alveoli

9. Diaphragm
Diaphragm and muscles contract, thoracic cavity enlarges letting air into the lungs
Controls breathing and lung capacity

11. Lung Model

12. Fun Facts
At rest, the body takes in and breathes out about 10 liters of air each minute.
* The right lung is slightly larger than the left.
* The highest recorded "sneeze speed" is 165 km per hour.
* The surface area of the lungs is roughly the same size as a tennis court.
* The capillaries in the lungs would extend 1,600 kilometers if placed end to end.
* We lose half a liter of water a day through breathing. This is the water vapor we see when we breathe onto glass.
* A person at rest usually breathes between 12 and 15 times a minute.
* The breathing rate is faster in children and women than in men.