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Questions and Answers
Which hormone is produced by osteocytes in bone to regulate phosphate levels in the blood?
Which of the following processes is directly facilitated by Vitamin D related to phosphate levels?
What is the effect of parathyroid hormone (PTH) on phosphate levels in the blood?
What hormone besides PTH affects phosphate reabsorption in the kidneys?
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Which of the following statements about blood phosphate regulation is true?
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Study Notes
Factors that Control Blood Phosphate Level
- Parathyroid Hormone (PTH): Decreases phosphate reabsorption at the proximal tubule, leading to low levels of phosphate in the blood.
- Fibroblast Growth Factor 23 (FGF23): A hormone produced by osteocytes in bone, reducing phosphate reabsorption by the kidneys, leading to low levels of phosphate in the blood.
- Vitamin D: Helps the small intestine and the kidney to reabsorb phosphate back into the bloodstream, leading to increased levels of phosphate in the blood.
Pathways Involved
- Kidneys: Responsible for calcium reabsorption and phosphorus excretion.
- Parathyroid Glands: Regulate calcium and phosphorus levels through PTH.
- Gut: Absorbs calcium and phosphorus.
- Bones: Involved in bone resorption, releasing calcium and phosphorus.
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Description
This quiz covers the hormones and vitamins that regulate phosphate levels in the blood, including parathyroid hormone, fibroblast growth factor 23, and vitamin D. Understand how these factors affect phosphate reabsorption and blood levels.
