plasma_membrane

plasma_membrane - ThePlasmaMembrane andHomeostasis...

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The Plasma Membrane  and Homeostasis
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Homeostasis – Maintaining a  Balance Cells must keep the proper  concentration of nutrients and  water and eliminate wastes. The plasma membrane is  selectively permeable – it will allow  some things to pass through, while  blocking other things.
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Structure of the Plasma  Membrane Lipid bilayer – two sheets of lipids  (phospholipids). Found around the cell, the nucleus,  vacuoles, mitochondria, and  chloroplasts. Embedded with proteins and  strengthened with cholesterol  molecules.
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What’s a Phospholipid? It’s a pair of fatty acid chains and a  phosphate group attached to a glycerol  backbone. Polar (water-soluble) heads face out  and the nonpolar fatty acids hang  inside.
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Membrane Proteins 1.  Determine what particles can pass  through the membrane. 2.  Serve as enzymes (may speed 
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plasma_membrane - ThePlasmaMembrane andHomeostasis...

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