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General Medicine
Brown tumors are benign fibro-osseous lesions that occur in the context of hyperparathyroidism due to increased osteoclast activity and bone resorption. They are typically seen in areas of high bone turnover.
Physiology
Answer: 2) The primary effect of parathyroid hormone during pregnancy is to increase serum calcium levels by mobilizing calcium from maternal bones for fetal use.
Periodontics
The part of the instrument that should remain parallel to the long axis of the tooth is the shank.