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Unformatted text preview: heroin readily enter the brain (because of their lipid solubility). This blood-brain barrier is established by the following: • Brain capillaries are less permeable than other capillaries because of tight junctions between the endothelial cells in the capillary walls. • The basal lamina (secreted by the endothelial cells) that surrounds the brain capillaries decreases capillary permeability. This layer is usually absent in capillaries found elsewhere. • Processes from astrocytes (a type of neuroglial cell) cover brain capillaries and are believed to influence capillary permeability in some way....
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- Fall '10
- Anthropology, Brain capillaries