The parathyroids are four tiny glands, located in the neck, that produce the parathyroid hormone. This hormone regulates the body's calcium levels.
Calcitonin: This hormone works opposite to parathyroid hormone, it lowers blood calcium levels by storing it in bones.
A condition characterized by weak and brittle bones due to loss of bone mass which can be caused by imbalance in regulation of calcium.
These are ductless glands that secrete hormones directly into the bloodstream. The thyroid and parathyroid glands are examples of endocrine glands.