What happens to the body/brain when people faint at the sight of blood?

561 views

What happens to the body/brain when people faint at the sight of blood?

In: Biology

You get spooked and your arteries and veins dilate. Your heart can’t keep the blood pressure up, so the blood pools in your legs and your blood pressure drops. So the blood can’t get to your brain. This causes you to faint. It’s called a [vasovagal response](https://www.mayoclinic.org/diseases-conditions/vasovagal-syncope/symptoms-causes/syc-20350527). And that’s why sitting down and squatting will prevent you from fainting, since it makes it easier for the blood to get to your brain.