Animal testing is inhumane and very unnecessary. There are so many different options available, There is no explanation for the poisoning, burning, and killing of about 100 mill animals each year causing them pain & fear. Animals are not little humans, and even tho we share a lot of our genes with other them the way our genes work is different.
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Physicians and surgeons have some of the toughest educational criteria of any health profession. A bachelor's degree, a four-year medical school degree, and 3-7 years in internship or residency programs are the minimum requirements.
Hormones are carried by the blood stream to their target cell once there they bind to the cell. the answer to your question is they are carried by the bloodstream.