Question

$what \: is \: blood \: brain \: barrior$

Answer 1

$Hey \: mate \: here \: is \: your \: answer...$
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$The \: blood \: brain \: barrier \: is \: \\ composed \:of \: high \: density \: cells \: \\ restricting \: passage \: of \: substnces \\ from \: the \: bloodstream \: much \: \\ more \: than \: do \: the \: endothelial \: \\ cells \: in \: capillaries \: elsewhere \: \\ in \: the \: body.....$

$Hope \: it \: helps.....$