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By the end of the test, these different kidney cell types had assembled into a glomerular capillary wall and could efficiently filter molecules by size.

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.