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Fluid-mosaic model. 1  Plasma membrane consists of a phospholipid bilayer studded with proteins, polysaccharides, lipids. 2  The lipid bilayer is semipermeable Regulates passage of substances into and out of the cell. H2O and some small, uncharged, molecules (O2, CO2) can pass through.
Lactate dehydrogenase (LDH) is a cyto-. plasmatic enzyme present in essentially all major organ. systems. The extracellular appearance of LDH is used to. detect cell damage or cell death [1â3]. Due to its extra-. ordinarily widespread distribution in the body, serum LDH. is abnormal in a host of disorders [3â9].