What Separates the Blood from the CSF in the Medulla

question 25

Multiple Choice

What separates the blood from the CSF in the medulla?

• A) a semipermeable membrane called the blood-brain barrier
• B) a membrane that is permeable to H+ and bicarbonate ions
• C) nothing-they are in direct contact
• D) a thick gelatinous membrane that is impermeable to CO₂ molecules

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