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68.7 MB (3.5 MB compressed)
6000 x 4000 pixels
50.8 x 33.8 cm ⏐ 20.0 x 13.3 in (300dpi)
KATERYNA KON / SCIENCE PHOTO LIBRARY KATERYNA KON / SCIENCE PHOTO LIBRARY
Illustration of the four parathyroid glands and a molecule of parathyroid hormone. The glands are situated behind the thyroid gland. They produce parathyroid hormone, which regulates the amount of calcium in the blood and within the bones.
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