The blood-brain-barrier keeps most bacteria, harmful cells, and many toxins from entering the nervous system.

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The blood-brain-barrier is a selectively permeable membrane that prevents certain substances, such as bacteria and harmful cells, from entering the brain and spinal cord. However, some toxins and infections, such as meningitis, can bypass or cross the blood-brain-barrier and cause damage to the nervous system.

The Blood-Brain-Barrier Keeps Most Bacteria, Harmful Cells, and Many Toxins