Science Common Sense

852 - What is the blood-brain barrier, and what does it do?

The blood-brain barrier is like a special shield that protects your brain. It's a layer of tiny cells that wraps around the blood vessels in your brain, and helps keep bad things out.

It works like a filter, letting good things like oxygen and food pass through to your brain, but keeping bad things like bacteria and viruses out. This helps keep your brain healthy and safe.

Think of it like a bouncer at a club, only letting the right people in and keeping the troublemakers out.