单词	blood-brain barrier
释义	blood-brain barrier noun ˈbləd-ˈbrān-  : a naturally occurring barrier created by the modification of brain capillaries (as by reduction in fenestration and formation of tight cell-to-cell contacts) that prevents many substances from leaving the blood and crossing the capillary walls into the brain tissues Example Sentences Recent Examples on the Web Woodworth watched images from the MRI on a computer screen from a control room as the commotion from the bubbles created temporary leaks in the protective layer around the brain known as the blood-brain barrier. Meredith Cohn, Baltimore Sun, 31 Aug. 2022 That’s because biomarkers from tumor cells, which could offer more information, are blocked by the blood-brain barrier from entering the body’s circulation, where they could be picked up in a blood test. Meredith Cohn, Baltimore Sun, 31 Aug. 2022 Magnesium L Threonate is a newer type of magnesium supplement that has been shown to be more effective at crossing the blood-brain barrier. The Salt Lake Tribune, 9 June 2022 In the brain, P-glycoprotein is present at high levels at the junction points, or the blood-brain barrier, between neurons and the dense network of blood vessels surrounding them. Dallas News, 29 June 2021 Ultrasound is used to open the blood-brain barrier in medical procedures, and acoustic stimulation of the aforementioned anatomical areas could produce symptoms consistent with AHIs. Beth Mole, Ars Technica, 3 Feb. 2022 These metals also have the ability to cross the blood-brain barrier, a feature of the human nervous system that defends the brain from pathogens and toxins in the blood, according to a 2015 study. Sudiksha Kochi, USA TODAY, 26 Jan. 2022 The same protein may be able to whisper its chemical message across the notoriously choosy blood-brain barrier and trigger anti-inflammatory processes in the brain. Emily Willingham, Scientific American, 8 Dec. 2021 Because of their molecular structure, endorphins cannot cross the blood-brain barrier. Outside Online, 7 Apr. 2021 See More Word History First Known Use 1934, in the meaning defined above Medical Definition blood-brain barrier noun : a naturally occurring barrier created by the modification of brain capillaries (as by reduction in fenestration and formation of tight cell-to-cell contacts) that prevents many substances from leaving the blood and crossing the capillary walls into the brain tissues —abbreviation BBB
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