parathyroid is an endocrine gland located at the back of the nec

parathyroid structure anatomical atoms hormone serum atomic endocrinology molecular glands activity hypercalcaemia hypocalcaemia parathyrin pth parathormone hypoparathyroidism remodeling calcium bone human gland thyroid hyperparathyroidism anatomy 3d endocrine disease illustration medical medicine healthcare model colorful stress research illness molecule secreted osteoclast