Describe what the blood-brain barrier is and how it protects the CNS. Explain why the area postrema is not protected by the blood-brain barrier.
What will be an ideal response?
The walls of capillaries in the brain are packed very tightly together to prevent any large molecules from crossing into the brain; this is the blood-brain barrier. This protects the CNS by making sure that only very small molecules and those that are fat soluble can enter the brain. The area postrema is not protected by the blood-brain barrier because this brain area has its own role in protecting you from damage. This brain area receives any ingested toxins from the blood and prompts vomiting to quickly remove those toxins from your system.
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