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Questions and Answers
Which of the following food sources is high in phosphorus?
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?
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?
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?
What is a normal plasma phosphorus level in adults?
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Which of the following is NOT a function of phosphorus?
Which of the following is NOT a function of phosphorus?
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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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