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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.
What is a nephron, and what does it do? A: A nephron is the filtering unit of the human kidneys, and its job is to regulate the concentration of water and soluble substances by filtering the blood. The nephron reabsorbs what the body needs to function and then excretes the rest as urine. Continue Reading.