Figure 32.1: The Arteries of Visible Size That Carry Blood to the Human Kidney To obtain this image, the arteries were injected with a liquid plastic that hardened after injection, and then the tissues were removed, leaving just this plastic cast. Keep in mind that, regardless of the complexity, the vessels visualized here are only the ones that can be seen with the naked eye. The microscopic vessels, which are even more profuse, are not visualized with this technique.