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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.
Hydroceles. Normal: The fluid around the testicles is absorbed. Noncommunicating hydrocele: The fluid stays around the testicles and is not absorbed. Communicating hydrocele: The fluid flows back and forth between the scrotum and the abdomen. Hydrocele of the cord: The fluid is located in the spermatic cord, between the scrotum and the abdomen. Credits