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OPRA Biomedical Sciences QUESTION #3800
Question 1
What is the physiological effect of parathyroid hormone (PTH) on calcium and phosphate metabolism?
  • Increased mobilisation of calcium from bone✔️
  • Decreased renal tubular reabsorption of calcium
  • Decreased resorption of phosphate from bone
  • Decreased excretion of phosphate
Correct Answer Explanation
PTH raises serum calcium by stimulating osteoclastic bone resorption, increasing renal tubular calcium reabsorption, and promoting renal phosphate excretion.