What exactly is the blood-brain barrier?
In: 99
There’s other great explanations here but I’ll try to get it down to the 5yo level
Imagine it is the city wall. Your brain is i side the city. When deliveries come to drop off their goods (oxygen, glucose, nutrients) and take away the trash (CO2) the delivery people (red blood cells) aren’t allowed into the city. They drop off their goods and stay outside the city wall, so they don’t potentially bring harmful things into the city.
With your muscles and other parts of the body, these “delivery drivers” are allowed into the shops (the muscles, organs).
If anyone hates this explanation or thinks I fucked up royally, please be kind
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