In order to continue enjoying our site, we ask that you confirm your identity as a human. Thank you very much for your cooperation. Remember that diffusion is a passive process, so when it occurs in a living organism the cells of that organism do not provide the particles involved with energy to diffuse. The particles that are moving about randomly have their own kinetic energy. Page 2
Unicellular organisms such as amoeba do not require transport systems due to their large surface area to volume ratio Multicellular organisms
Some examples of transport systems in plants and animals
Some examples of exchange surfaces in plants and animals Properties of exchange surfaces
Calculating the surface area to volume ratio Page 3
Assess your score The Need for Transport
Assess your score The Need for Exchange Surfaces
Figure 1
Figure 2 Assess your score The Need for Exchange Surfaces
Assess your score Factors Affecting the Rate of Diffusion
Assess your score Factors Affecting the Rate of Diffusion
Figure 3 Assess your score Factors Affecting the Rate of Diffusion
Figure 4 Assess your score Factors Affecting the Rate of Diffusion Page 4 |