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There are 20 feet of blood vessels in each square inch of human skin.
The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.
Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
![A client is having an endoscopy performed by a physician who views the upper gastrointestinal intern](https://biology-forums.com/gallery/47/medium_18099_24_10_12_4_35_00.jpeg)
![Breast cancer. Notice the tumor growing within a lactiferous gland, which occurs in infiltrating duc](https://biology-forums.com/gallery/47/medium_14755_26_10_12_5_31_30_97082032.jpeg)