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. It provides x-ray or gamma ray images of the interior of the body with unprecedented clarity and detail. The x-ray image is a superimposed set of shadows of everything between the source and detector, which can make finding a minute tumor or a tiny blocked artery quite difficult. A computer memorizes and displays a series of three dimensional cross sections of the CAT scanned body.