S for P 0.0 / 5 ? AllIntroUniversityAll boards Created by: Ciara SimpsonCreated on: 06-04-19 18:05 what is passive transport? substances can cross the cell membrane down the concentration gradient without using energy 1 of 16 what is osmosis? water molecules move across the membrane down the concentration gradient 2 of 16 what is simple diffusion? lipid soluble materials dissolve in the membrane lipids crossing the membrane 3 of 16 what is channel mediated diffusion? water soluble materials cross the membrane through channels 4 of 16 what is carrier mediated diffusion? substances unable to diffuse use specialised protein carriers to attract and bind to these substances, helping them cross 5 of 16 what is selective permeability? substances can either enter or leave the cell 6 of 16 mechanisms that affect substances crossing the membrane? particle size, pores, pumps and carriers 7 of 16 what are membrane proteins? some are enzymes, some are receptors 8 of 16 what do transmembrane proteins do? they form channels and allow water soluble ions across the membrane 9 of 16 integral proteins and membrane lipids are amphipathic which means they have hydrophobic and hydrophilic parts 10 of 16 the polar part of the lipid is the head of the lipid - hydrophilic 11 of 16 the non polar part of the lipid is the fatty acid tail of the lipid - hydrophobic 12 of 16 the structure of the plasma membrane? two layers of lipid molecules, the lipid bilayer 13 of 16 cells grouped together = tissues 14 of 16 tissues grouped together = organs 15 of 16 organs grouped together = systems 16 of 16
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