For centuries, humanity has experimented on animals for a variety of different reasons. The first experiments with animals were originally born out of curiosity, but over time they became a necessity to find medicines that could cure viruses and a myriad of diseases. If it were not for the existence of animals, humans would be left to experiment on themselves at a high rate, which would create a worldwide moral dilemma. Such a dilemma could be dictated by the question of who should be chosen for testing; should this be a particular race or class of people? Animals commonly used in medical research are rats and chimpanzees. Over time these species have proven abundant and have shown the ability to withstand various testing regimes that mimic human experimentation. “The need to use animals in research, particularly in medical research, is due to the need to determine the toxicity and dangers of new drugs.” (Prater 1). Animals are great learning tools for medical students. “For basic research, for understanding a disease, dogs are an excellent mimic of the human cardiovascular system.” (Dixon 1). As can be seen, the use of animals as cruelty avoids the death of numerous human beings. Animals like guinea pigs can be tested instead of performing a huge surgery on a human and he/she doesn't make it. The effect of some animals does not always affect people, but it can give you an idea of ​​the dangers you may face. Other animals such as cats, mice, hamsters, rabbits, pigs and sheep are also tested in the laboratory, "animal research" has played a vital role in virtually every major medical advance of the last century, both for human and human health. animal. From antibiotics to blood transfusions, from dialysis to organs... at the center of the article ......des Improvements." PubMed.com. NP May 2009. Web. 21 November 2011. Gargaro, Carolyn C. "Animals used for medical research." Gargaro.com, July 1991. Web. November 21, 2011, Ray. "The use of the sentient in basic research is justifiable." November 21, 2011. Jessen, Walter. "Animal research: welfare of animals versus animal rights." Helium.com NP November 2007. Web. 21 November 2011. Rolling, Bernard E. "Animal research: a moral science." "The long fight against animal testing." Guardian.com .NP July 2009. Web. November 21, 2011. Trull, Frankie L. “The Essential Need for Animals in Medical Research.” AmericanChronicle.com November 21. 2011.