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Cell boundaries
HBio Transport Set 1
Term | Definition |
---|---|
homeostasis | constant internal environment |
fluid mosaic model | cell membrane molecules can move around |
phospholipid bilayer | cell membrane is made of 2 layers of lipid molecules |
concentration gradient | exists when particles are in higher concentration in one area and lower concentration in another area |
permeable | ability of a substance to pass through the membrane |
semi-permeable | ability of only SOME substance pass through a membrane |
selectively permeable | cell membrane chooses what will pass through |
equilibrium | when the rate of particles spreading is even throughout a given area |
why is the cell membrane selectively permeable? | to maintain homeostasis |
2 functions of a cell membrane | maintain homeostasis & support/ protection |
phospholipids | main component of cell membranes |
hydrophilic | water loving |
hydrophobic | water hating |
channel protein | proteins that make a channel that allow certain molecules to cross a membrane |