Andrew Huberman· PhD
So, probably very early on in mamalian evolution, they evolved these special blood vessels in the limited surface areas that don't have fur. And as I said, what these blood vessels are are shunts between the arteries and the veins. Arteries and veins are both lowresistance vessels. So you can have high flow rate. Capillaries which normally are between arteries and veins are high resistance because they're very tiny.