5 Questions
Which of the following food sources is high in phosphorus?
Fish
Which segment of the gastrointestinal tract is primarily responsible for the absorption of phosphorus?
Duodenum
What effect does calcitriol have on phosphorus absorption?
Increases absorption
What is a normal plasma phosphorus level in adults?
2.5-4.5 mg/dl
Which of the following is NOT a function of phosphorus?
Muscle contraction
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
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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