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Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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explain the role of the calcitonin and parathyroid hormone in calcium homeostasis

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  1. Parthyroid hormone:-  Calcium is required  for  a variety of important physiologic processes, including neuromuscular functioning,thus blood calcium levels are closely regulated.
  2. The parathyroid glands are small structures located on the posterior thyroid glands that produce  parathyroid hormone[PTH],which regulates blood calcium levels.
  3. PTH increases blood calcium levels by releasing calcium from bones and increasing the amount of calcium from small intestine.
  4. In contrast ,elevated blood calcium levels inhibit secretion of parathyroid gland.
  5. Abnormally high activity of the parathyroid gland can cause hyperparathyroidism.In contrast abnormally low blood calcium levels may be cause hypoparathyroidism.
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