STEVE HORRELL / SCIENCE PHOTO LIBRARY STEVE HORRELL / SCIENCE PHOTO LIBRARY
Insulin pen needle. This syringe is used by diabetes mellitus sufferers to inject measured doses of insulin into their blood stream. Diabetes is a metabolic disorder in which unused sugars (such as glucose) accumulate in the blood and urine. Monitoring of blood glucose levels allows diabetics to control the disease through diet or medication such as insulin injections.
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