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plasma membrane function

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plasma membrane function

Postby burningredphoenix » Sun Nov 20, 2005 10:21 pm

What do you guys know about plasma membrane function
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Postby Poison » Sun Nov 20, 2005 10:32 pm

the first things that come to my mind:
-It is a selectively permeable membrane (a barrier) that makes the cell a compartment
-has role in the interactions
-provides communication with the envionment
-transports materials in and out of the cell (endo-exocytosis)
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Postby irosta » Sat Nov 26, 2005 3:38 pm

hi all my friend what think about plasma???
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Postby MrMistery » Sat Nov 26, 2005 5:38 pm

plasma as in plasma membrane or plasma as a state of matter?
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Postby cool A-level student » Mon Nov 28, 2005 2:53 pm

structure of the plasma membrane:

we'll you have a glycerol and 2 fatty acids with a phosphate group (like triglycerol but with 1 fatty acid replaced with a phosphate group) the 2 fatty acids are the "tails" of the structure, they are hydrophobic and so water hating/fearing, these point inwards in the membrane in order to stay away from the water.
The glycerol heads are hydrophilic or water loving, and so this is the outer edge of the membrane as it tries to get away from water and the tails try to get away.

this forms the main structure of the plasma membrane.

Proteins:
You can have intrinsic carrier proteins in the plasma membrane, when random movement causes a substance to reach and react it alters the proteins shape and the substance passes through, sort of as if it goes through a door.

you can have intrinsic channel proteins as we'll, these are long channels in whcih substances can pass through, and simply as they have a hole or channel in them passing through is easy.

there are other proteins as we'll!

Cholestorel:
this strengthens ther membrane.

editted: correction made!
Last edited by cool A-level student on Tue Nov 29, 2005 2:04 pm, edited 2 times in total.
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Postby MrMistery » Mon Nov 28, 2005 7:45 pm

we'll you have a glycogen and 2 fatty acids

glycerol...
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Postby cool A-level student » Tue Nov 29, 2005 2:01 pm

<slaps head>
stupid me, ur right
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