The blood-brain barrier filters what reaches your neurons
Tight junctions in brain capillaries form a selective gate. Many molecules that roam freely in the body never cross into neural tissue without special transporters.
That shield keeps toxins and pathogens out — and complicates drug design, because medicines must be engineered to pass or bypass the barrier.
Your skull is not the only wall. A microscopic customs desk decides what the thinking tissue is allowed to taste.
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