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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The blood-brain barrier (BBB) is a semipermeable membrane that separates the blood from the cerebrospinal fluid (CSF) in the brain, including the medulla, allowing selective passage of substances while blocking others to maintain a stable environment for the brain.

What Separates the Blood from the CSF in the Medulla