OUELLETTE & THEROUX, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY OUELLETTE & THEROUX, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Thyroid gland. Coloured gamma scan (scintigram) of a healthy human thyroid gland, in front view. The black line is a lead marker on the sternum. The thyroid is an endocrine gland at the base of the neck, and is divided into two lobes (as seen here). A radioactive tracer highlights active areas in the gland: blue (low activity); yellow (high activity). The thyroid produces and stores hormones that control the body's metabolic rate, influence growth and maturation, and regulate blood calcium levels. A gamma scan is made by a gamma camera, which detects radioactivity from a tracer injected into the body.
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