| 单词 | blood-brain barrier |
| 释义 | blood-brain barrier[ bluhd-breyn ] / ˈblʌdˈbreɪn / noun Physiology.a layer of tightly packed cells that make up the walls of brain capillaries and prevent substances in the blood from diffusing freely into the brain: passage across the cell membranes is determined by solubility in the lipid bilayer or recognition by a transport molecule. Origin of blood-brain barrierFirst recorded in 1940–45 Words nearby blood-brain barrierblood and thunder, blood-aqueous barrier, blood bank, bloodbath, blood blister, blood-brain barrier, blood brother, blood capillary, blood cell, blood-cerebrospinal fluid barrier, blood clot Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Cultural definitions for blood-brain barrierblood-brain barrier The separation of the brain, which is bathed in a clear cerebrospinal fluid, from the bloodstream. The cells near the capillary beds external to the brain selectively filter the molecules that are allowed to enter the brain, creating a more stable, nearly pathogen-free environment. notes for blood-brain barrierOxygen, glucose, and white blood cells are molecules that are able to pass through this barrier. Red blood cells cannot. The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. Medical definitions for blood-brain barrierblood-brain barrier n.A physiological mechanism that alters the permeability of brain capillaries so that some substances, such as certain drugs, are prevented from entering brain tissue, while other substances are allowed to enter freely. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for blood-brain barrierblood-brain barrier A physiological mechanism that alters the permeability of capillaries in the brain, so that some substances, such as certain drugs, are prevented from entering brain tissue, while other substances are allowed to enter freely. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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