Many Medications Introduced into the Bloodstream Cannot Directly Affect the Neurons

question 143

Multiple Choice

Many medications introduced into the bloodstream cannot directly affect the neurons of the CNS because

• A) the endothelium of CNS capillaries forms a blood- brain barrier.
• B) the neurolemma is impermeable to most molecules.
• C) ependymal cells restrict the flow of interstitial fluid between the capillaries and the neurons.
• D) astrocytes form a capsule around neurons.
• E) oligodendrocytes form a continuous myelin sheath around the axons.

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