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Chapter 7 - Coggle Diagram
Chapter 7
Fluidity of Membranes
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As temperatures cool, membranes switch from a fluid state to a solid state
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Membranes must be fluid to work properly; fluidity affects both permeability and movement of transport proteins
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Passive Transport
Diffusion is the movement of particles of any substance so that they spread out evenly in the available space
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Osmosis deals with the movement of water, and the water follows the higher concentration of solute
- Osmosis requires semi permeable membrane
- Diffusion requires solution gradient (barrier)
Substances diffuse down their concentration gradient, the region along which the density of a chemical substance increases or decreases
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Bulk Transport
Bulk transport is a cellular process that moves large molecules or particles into or out of a cell using membrane-bound vesicles
Small molecules and water enter or leave the cell through the lipid bilayer or via transport proteins
Large molecules, such as polysaccharides and proteins, cross the membrane in bulk inside vesicles.
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Active Transport
Active transport requires energy, usually in the form of ATP hydrolysis, to move substances against their concentration gradients
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