c. When circulating calcium levels are too high, production of parathyroid hormone is inhibited.
Parathyroid gland situated in the neck releases parathyroid hormone (PTH) which plays a key role in regulation of calcium levels in blood.
Parathyroid hormone is mainly controlled by the negative feedback of calcium levels in the blood to the parathyroid glands.
Low calcium levels in the blood stimulate parathyroid hormone secretion, whereas high calcium levels in the blood prevent the release of parathyroid hormone.
It does this through its actions on the kidneys (reduce loss of calcium in urine), bones (release bone calcium) and intestine (increase calcium absorption).
If body has too much or too little parathyroid hormone, it can cause symptoms related to abnormal blood calcium levels. It also controls phosphorus and vitamin D levels.
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