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barrier |
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barrier noun bar, barricade, bound, boundary, check, confines, enclosure, encumbrance, fence, hindrance, hurdle, impediment, interference, limit, obstacle, obstruction, partition, prevention, preventive, protective device, rampart, restraining device, restriction, safeguard, stay, stop, stumbling block, termination, wall See also: bar, bulwark, check, complication, damper, deterrence, deterrent, enclosure, estoppel, handicap, hindrance, impediment, limitation, mete, obstacle, obstruction, panoply, predicament, prohibition How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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It is known that ozone and its reaction products can cross the blood-gas barrier and enter the bloodstream, and exposure to ozone can cause oxidative stress, which has been shown to disrupt testicular and sperm function. Type II alveolar cells also can turn into type I alveolar cells, which form the thin, blood-gas barrier through which gas exchange occurs during respiration. |
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