The thyroid gland is a butterfly-shaped endocrine gland located in the ____, just below the Adam's apple. The adrenal glands are a pair of small, ____-shaped endocrine glands located on top of each kidney. The ____ is a glandular organ located behind the stomach in the abdominal cavity. Most people have ____ parathyroid glands, and their primary function is to regulate calcium and phosphorus levels in the body.

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