I’ve known people that easily faint at the slightest sight of blood, they don’t necessarily have to be the one bleeding, just seeing a little bit from someone else causes them to faint. How can something that small causes your whole body to shut down?
In: Biology
Can the mods put a sticky saying no-one knows how the human brain works?
Nobody knows.
But what we do know is the brainstem sends signals to your major blood vessels causing them to open up, in turn causing your blood pressure to drop, making you feel dizzy, sick and sometimes even causing you to black out. This is called the “vasovagal response”.
We think the reason it does this is to stop you ingesting things that could poison you or going near things that could hurt you.
Latest Answers