Active Transport, Diffusion And Osmosis
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Define diffusion
The movement of molecules from a region of higher concentration to a region of lower concentration
Define osmisis
The net movement of water molecules from a region of lower solute concentration to a region of higher solute concentration
Define Active Transport
The movement of particles across a cell membrane from a region of lower concentration to a region of higher concentration
Which mode of transport in cells move against the concentration gradient?
Active transport
What are special exchange surfaces
Cells adapted for the exchange of certain materials, having a very high surface area to volume ratio
Name two special exchange surfaces in humans
Villi in small intestine Alveoli in lungs
Name two specialized exchange surfaces in plants?
Spongy mesophyll of a leaf Root hair cells