Medicine
Cerebral Blood Flow
Quick fact
Cerebral blood flow is so precisely regulated that even a momentary drop can cause fainting, while a complete blockage for just a few minutes can lead to irreversible brain damage.
Why this is interesting
Your brain makes up only about 2% of your body weight, yet it uses up to 20% of the oxygen you breathe. How does your body ensure this demanding organ always gets enough blood, especially when you're thinking hard or running from danger?