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Selectively Permeable
Membranes don’t let everything get through, only specific things
What can get through for example: water, CO2, C6H12O6, waste, heat
fluid, flexible
Like a pool of ping-pong balls, membranes are ? and ?
self-repair
Membranes can ? if damaged
proteins
Membrane ? have special functions
polar
? things struggle to pass through membranes
gets stuck to phospholipid heads
ions
? and large molecules also have trouble getting through membranes because they get stuck / repelled
helper
Polar things, ions, and large molecules need a ? to get past a membrane