Phosphorus Functions and Absorption
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Questions and Answers

Which of the following food sources is high in phosphorus?

  • Apple
  • Rice
  • Broccoli
  • Fish (correct)

Which segment of the gastrointestinal tract is primarily responsible for the absorption of phosphorus?

  • Colon
  • Duodenum (correct)
  • Ileum
  • Stomach

What effect does calcitriol have on phosphorus absorption?

  • Decreases reabsorption
  • No effect
  • Increases absorption (correct)
  • Decreases absorption

What is a normal plasma phosphorus level in adults?

<p>2.5-4.5 mg/dl (C)</p> Signup and view all the answers

Which of the following is NOT a function of phosphorus?

<p>Muscle contraction (A)</p> Signup and view all the answers

Study Notes

Phosphorus Sources

  • Richly found in meat, fish, milk, and egg yolk

Phosphorus in the Body

  • Total body phosphorus: 500-700 grams
  • Absorbed in the duodenum and jejunum through active transport

Factors Affecting Phosphorus Absorption

  • Calcitriol increases phosphorus absorption
  • Parathyroid hormone (PTH) decreases phosphorus absorption
  • Antacids decrease phosphorus absorption
  • High calcium levels in the lumen decrease phosphorus absorption

Phosphorus Plasma Levels

  • Normal range for children: 4-6 mg/dl
  • Normal range for adults: 2.5-4.5 mg/dl

Phosphorus Functions

  • Essential for bone and teeth structure, found in crystals with calcium and magnesium
  • Helps maintain acid-base balance of plasma as a buffer

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Description

Learn about the functions of phosphorus, its absorption, and factors affecting its absorption in the body, including its role in bone structure and acid-base balance.

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