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Teri M Cell Membrane

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Teri Mitton

on 15 October 2010

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Transcript of Teri M Cell Membrane

The Cell Membrane
The Fluid Mosaic Model
The membrane is a fluid structure
with a mosaic of various proteins
embedded on or attached to a double
layer (bilayer) of phospholipids with
carbohydrates and lipids attached.
Phosophlipids are not stationary
they drift slowly and even switch places.
Unsaturated phospholipids increase fluidity and cholesterol decrease fluidity (at certain temperatures).
There are various types of proteins
that function for cell tansport, cell communication and cell recognition.
Cell Transport
Osmosis:
the movement of water across a
semipermeable membrane along
the concentration gradient.
Diffusion in the movement of
particles across a membrane along the concentration gradient.
Active VS Passive Transport
Cells will react by losing or gaining water dependant on the solution they are in. Solutions can be hypertonic, hypotonic, or isotonic.
Endocytosis and Exocytosis
Active transport requires carrier proteins
and energy in order to move material against
the concentration gradient.
Cotransport is when transport involves
proteins coupled together. One protein pumps
protons in one direction and the protons act
on the other protein to force in to carry
molecules into or out of the cell.
Facilitated diffusion is diffusion through a protein channel or carrier.
The End......
Full transcript