CELLULAR MEMBRANES COMPARTMENTALIZE THE CELL:Cardura
Posted by Surgery on Jul 10, 2008
Cellular membranes create environments for the efficient performance of many biological processes. The plasma membrane is a barrier between the inside and the outside of the cell. Subcellular organelles, such as mitochondria and lysosomes, are also separated from one another by membranes. Cellular membranes are composed primarily of lipids, making these barriers basically impermeable to hydrophilic molecules and ions. (Cardura)
Cardura lipid
Specialized protein structures within the membrane allow the exchange of molecules and ions across these lipid barriers. The basic component of a cellular membrane is the lipid bilayer, which is composed of phospholipids (phosphoglycerides: Cardura ). The phosphate group of phospholipids is usually esterified by various alcohols (e.g., ethanolamine, choline, serine). These polar heads are exposed to the aqueous environment, whereas the fatty acid groups get together side by side forming the lipid bilayer. Sugar-containing lipids called sphingolipids are also present in membranes. Cholesterol is another component of cellular membranes. (Cardura)
Tags: Cardura, Cell Structure and Function
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