Capillaries connect the ends of the smallest arteries with the beginnings of the smallest veins .
Carotenoids also provide protection from UV damage and can prevent the development of cancer in ecoerimental animals. They are usually colored bright yellow, orange or red. Carotenoids make carrots orange, and fall leaves a beautiful array of colors. A modern diagnostic tool for which the inventors have received the Nobel Prize in medicine and physiology. CAT stands for computerized axial tomography.