Cockroaches!

AND HOW THEY DO NOT DROWN:

There is fluid in their tracheal. An experiment: Place 5 cockroaches in 5 small plastic containers filled with water. Wait for half an hour. Take them out. Leave them in dry plastic containers. One day later, they will be alive and kicking!

Carbon dioxide lower in lungs--> diffuse out from blood Oxygen higher in lungs--> diffuse into blood

Properties of Gas Exchange Surfaces: 1. Large surface Area: Volume ration 2. Thin membrane 3. Moisture 4.Efficient transport system (circulatory system)--Requires concentration gradient 5. Ventilation: ventilating system