WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY
Insulin injection. A diabetic fills a syringe with insulin from a small phial. Regular injections of insulin are needed in diabetes, where the hormone is absent from the patient's bloodstream. Without insulin the body fails to take up glucose from the blood, potentially leading to coma and death. With modern treatment and sensible self-monitoring, however, diabetics can lead a near-normal life.
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