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Factors Controlling Blood Phosphate Level

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Factors Controlling Blood Phosphate Level

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Questions and Answers

Which hormone is produced by osteocytes in bone to regulate phosphate levels in the blood?

Calcitonin

Aldosterone

Parathyroid hormone (PTH)

Fibroblast growth factor 23 (FGF23) (correct)

Which of the following processes is directly facilitated by Vitamin D related to phosphate levels?

Increases phosphate excretion by kidneys

Decreases bone resorption releasing phosphate

Increases phosphate reabsorption by kidneys and intestine (correct)

Decreases phosphate reabsorption by kidneys

What is the effect of parathyroid hormone (PTH) on phosphate levels in the blood?

It increases phosphate absorption from the intestine, raising blood phosphate levels.

It decreases phosphate reabsorption at the proximal tubule, lowering blood phosphate levels. (correct)

It increases phosphate reabsorption in the kidneys, raising blood phosphate levels.

It has no effect on blood phosphate levels.

What hormone besides PTH affects phosphate reabsorption in the kidneys?

<p>Fibroblast growth factor 23 (FGF23)</p> Signup and view all the answers

Which of the following statements about blood phosphate regulation is true?

<p>Vitamin D increases phosphate reabsorption in both the small intestine and kidneys.</p> Signup and view all the answers

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.