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| GLOSSARY Blood-brain
barrier: The blood-brain
barrier prevents potentially harmful substances in the blood
from entering the brain. Endothelial cells in the small blood
vessels are packed much more densely in the brain than in other
parts of the body, making it more difficult for substances to
pass out of the bloodstream. In general, fat-soluble molecules
penetrate the brain while molecules that are not fat-soluble
do not. However, certain factors can affect the effectiveness
of the blood brain barrier. |
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