Circulatory Systems
Animals have a beating heart, veins, and arteries tracing through every part of their body. If a vein or artery is cut off, such as when cutting off your circulation, it begins to feel tingly and starts throbbing. If one were to cut off their circulation long enough, it may even kill off the part of the body the bloodstream was supposed to run through. One of its functions is to carry oxygen from the lungs to the cells in the body, allowing the cells to perform cellular respiration.