For centuries, humanity has experimented on animals for a number of different reasons. Early animal experiments originally grew out of curiosity, but eventually became a necessity to find drugs to cure viruses and a myriad of diseases. Without the existence of animals, humans would be forced to experiment on themselves at a high rate, creating a global moral dilemma. Such a dilemma might be dictated by the question of who should be chosen for the experiment; should it be about a particular race or class of people? Animals commonly used in medical research are rats and chimpanzees. Over time, these species have proven to be abundant and have demonstrated the ability to withstand different testing regimes that mimic human experimentation. “The need for animals in research, especially in medical research, is due to the need to determine the toxicity and dangers of new drugs.” (Prater 1). Animals are excellent learning tools for medical students. “For basic research, to understand a disease, dogs are an excellent mimic of the human cardiovascular system.” (Dixon 1). As it can be considered a form of cruelty, the use of animals prevents the deaths of many humans. Animals such as guinea pigs can be tested instead of performing a huge surgical procedure on a human being and the human being does not survive. The effect of certain animals does not always affect humans, but it can give you an idea of ​​the dangers you might encounter. Other animals like 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 – so much for human and animal health From antibiotics to blood transfusions, from dialysis to organs-...... middle of article ......improvements." PubMed.com. NP May 2009. Web. November 21, 2011.Gargaro, Carolyn C. “Animals Used in Medical Research.” Gargaro.com NP July 1991. Web November 21, 2011. Greek, Ray. “Is the use of Sentient in basic research justified.” November 21, 2011. Jessen, Walter. “Animal research: animal welfare versus animal rights.” » HighlightHealth.com, September 2010. Web, November 21, 2011. Prater, Alicia M. “Should Animals Be Used for Experimentation.” Helium.com. NP November 2007. Web. November 21, 2011. Rolling, Bernard E. “Animal research: a moral science”. Emboreports.com, August 2008. Web, November 21, 2011. "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 October 2005. November 21. 2011.