The respiratory (ventilation) system.

1. The respiratory system
Structure
Breathing

2. Structure
Taken from: http://www.britannica.com/EBchecked/media/107200/The-alveoli-and-capillaries-in-the-lungs-exchange-oxygen-for

3. 7 small alveoli provide more surface
area and hence more gas exchange!
1 single large alveolus 7 smaller alveoli
Adapted from: http://en.wikipedia.org/wiki/File:Alveoli_diagram.png

4. Breathing
The fish respiratory system has two connections to the
environment.
Adapte from: http://www.bio.utexas.edu/faculty/sjasper/Bio213/chordates.html

5. Breathing
Humans only have one opening, which is why we need to
inhale and exhale!
Taken from: http://www.whitetigernaturalmedicine.com/wp-content/uploads/2011/09/breathing.jpg

6. by:
Josue Naranjo