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Researchers hope these artificial capillaries will aid in the development of better snakebite treatments while lowering the dependence on animal models.

There, they feed into a second network of capillaries that supply oxygen deeper into the tissue.

That’s in part because consistent and frequent exercise prompts your body to form new capillaries.

"We have big arteries and smaller branches, the capillaries. They are extremely thin, penetrating your brain and spinal cord, and bringing oxygen places so they can survive," Christopoulos said.

But one big challenge in tissue engineering is creating blood vessel networks in artificial organs that work like natural ones, from tiny capillaries to larger arteries.