Cell MembraneFunctions

Surroundorganellesinside cells

Provideattachment sitesfor enzymes etc.

Partially-permeable

Involved incell signalling

Electric signalscan pass

along them

Controlwhat passesthrough them

Small oruncharged

particles canpass throughphospholipids

Proteinchannels

and transportproteins control

passageof large orchargedparticles

Isolatereactions

insideorganelles

from cytplasm

Substanceproduced by

one cell docksinto a receptorin the plasma

membraneof anotherReceptors

includeglycoproteins

andlipoproteins

E.g. membraneof the axonof a motor-

neuronetransmits

actionpotentials

from the CNSto a muscle

E.g. innermembrane ofa chloroplast

containschlorophyllneeded for

photosynthesis