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Animal Testing helps improve or provide new medical procedures for animals and humans. Huge medical discoveries that have changed peoples lives when they have diseases, like for people with diabetes. “In the early 20th century, the British physiologist Ernest Starling devised a heart-lung preparation in dogs to study the mechanics of heart contractions” (Rose). Other important medical discoveries have come from animal testing, such as the discovery of blood circulation, have helped doctors know where to inject vaccines and insert IVs. “In 1628, the English scientist William Harvey published his description of the circulation of the blood, based on observations made on a variety of invertebrates and vertebrates, including dogs” (Rose). Animals are also used to test new surgical techniques, and some animals are used for specific surgical research. "Nonhuman primates are valuable for studies on the eye and blood and on atherosclerosis; the rhesus monkey is extensively used for experimental surgical techniques" ("Animal Experimentation"). Primates are used for eye and blood, and atherosclerosis research and rabbits are often used to test cosmetics and toxicity ("Animal Experimentation").