Many Medications Introduced into the Bloodstream Cannot Directly Affect the Neurons

question 151

Multiple Choice

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

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

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