Release of calcium from bone in to blood is controlled by:
Correct answer: A. Parathormone (PTH)
- A. Parathormone (PTH)
- B. Calcitonin
- C. Thyroxine
- D. Both (a) & (b)
Explanation
The release of calcium from bone into the blood is controlled by parathyroid hormone (PTH). PTH is produced by the parathyroid glands and is responsible for raising blood calcium levels. It does so by stimulating osteoclasts to break down bone tissue, releasing calcium into the bloodstream. Additionally, PTH enhances calcium reabsorption in the kidneys and promotes the activation of vitamin D, which further aids in calcium absorption from the diet.Calcitonin, on the other hand, serves to lower blood calcium levels by encouraging calcium deposition in bones and increasing its excretion through the kidneys. Thyroxine does not play a direct role in calcium regulation. Therefore, the correct answer is parathormone.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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