Q 1. Why are ions and glucose necessary components of the cerebral spinal fluid? 2. Explain what adaptations make the blood brain barrier relatively impermeable. 3. Vistaril is an anti-histamine that is able to pass through the blood brain barrier. However, Allegra is an anti-histamine that is not able to pass through the blood brain barrier. Using your knowledge of the blood brain barrier explain, why only vistaril is permeable.
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