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Parathyroid hormone (PTH) is a peptide
hormone produced by the parathyroid gland. Which of the following statements is
NOT correct regarding the biological functions of PTH?
- Stimulates the activation of vitamin D in
kidneys
- Increases the level of calcium in blood
by stimulating the activity of osteoblasts
- Enhances the reabsorption of calcium in
kidneys
- Increases the level of phosphate in blood
by stimulating the activity of osteoclasts
- Inhibits the reabsorption of phosphate in
kidneys
Answer: B
The level of calcium in blood is
increased due to the stimulation of osteoclasts; osteoclasts are bone-resorbing
cells.
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