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5 Cards in this Set

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What does gas exchange in all organisms ultimately rely on?
diffusion
What are 3 features that facilitate diffusion?
1.The respiratory surface must remain moist.
2. Cells lining respiratory surfaces must be thin.
3. The respiratory surface must have a large surface area.
The transfer of gases from the environment to the blood, and then to the cells and back again, usually occurs in stages that alternate what two things?
bulk flow and diffusion
The movement of many molecules of a gas or fluid in unision from an area of higher pressure to an area of lower pressure
bulk flow
The net movement of particles from a region of high concentration to a region of low concentration, driven by the concentration gradient.
diffusion