Biology Lecture Test 3

Front 1

What does gas exchange in all organisms ultimately rely on?

Back 1

diffusion

Front 2

What are 3 features that facilitate diffusion?

Back 2

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.

Front 3

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?

Back 3

bulk flow and diffusion

Front 4

The movement of many molecules of a gas or fluid in unision from an area of higher pressure to an area of lower pressure

Back 4

bulk flow

Front 5

The net movement of particles from a region of high concentration to a region of low concentration, driven by the concentration gradient.

Back 5

diffusion