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Cell Membrane

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by

Saif Al Manam

on 30 April 2013

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Transcript of Cell Membrane

What is a cell membrane? Structure that surrounds a cell
It controls what enters and leaves the cell
It allows a number of food molecules to pass in and out, such as glucose and CO2 Cell Membrane's Components Phospholipids Proteins Cholesterol Glycoproteins Phospholipid Proteins Structure support
Communication
Recognition
Transport Cholesterol Cholesterol molecules act as a patching substance
It helps the cell to maintain its level of fluidity Methods of Transport Through the Membrane Diffusion Osmosis Protein Carrier Transport Thank you Thank you Facilitated Diffusion Active Transport Sodium/Potassium Pump Transport Requiring Vesicles Endocytosis Exocytosis Phagocytosis: Pinocytosis: Receptor-mediated endocytosis: Types of Endocytosis Moving of molecules from high to low concentration
Moves along the concentration gradient
Mostly moving of molecules into and out of the cell Moving of particles from high to low concentration
Moves along the concentration gradient
Mostly moving of liquid particles into and out of the cell Diffusion of molecules across a membrane through channels in certain proteins
Moving along the concentration gradient
Does not require energy from ATP Movement of molecules or ions across a membrane
Moving against a concentration gradient
Requires energy from ATP Specialized protein in a cell membrane that transports sodium ions (Na+) out of a cell and potassium ions (K+) into a cell
Moving against their concentration gradients "cell eating" involoves the movement of large particles into a cell "cell drinking" involves the transport of liquid into vesicles. Moves a specific molecule into a cell when the molecule binds to a protein on the cell membrane Glycoproteins protein combined with a carbohydrate, embedded in the cell membrane, that functions in cell communication or recognition Glycocalyx Is a general term referring to extracellular polymeric material. They are sugar chains that attach to communication proteins.
Produced by some bacteria, epithelia and other cells
They can also lubricate cells and act as an adhesion layer for them. Glycocalyx &
Full transcript