1. Gas Exchange in Mammals
L2 Biology

2. Requirements for all gas exchange systems
Allows the gases to get to and from the cells
Keeps the gas exchange surfaces moist
A large surface area: volume ratio
Concentration gradient maintained
Thin membrane (easier gas movement)
Permeable membrane that allows the dissolved gases to pass freely but not water or other chemicals
Protection (from internal and external environment)
Support (from other parts of body, ribs etc)
Allows safe and clean air to get to the gas exchange tissues

3. Inhalation Exhalation Expiration Inspiration Ventilation
Breathing
Inhalation
Exhalation
Expiration
Inspiration
Ventilation

7. Diffusion Oxygen Carbon dioxide
Gas Exchange
Diffusion
Oxygen
Carbon dioxide