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Questions and Answers
Which statement about phosphorus in the human body is correct?
Which statement about phosphorus in the human body is correct?
- It is only present as free elemental phosphorus.
- It participates in essential biochemical processes. (correct)
- It is mainly found in the serum/plasma.
- It is only found in bones and teeth.
In what form is the majority of phosphorus found in the human body?
In what form is the majority of phosphorus found in the human body?
- As phosphoric acid in the blood.
- As free elemental phosphorus.
- As a component of nucleic acids in the nucleus.
- Inorganic phosphate in bones and teeth. (correct)
What form of phosphorus is mainly measured in routine biochemical analysis?
What form of phosphorus is mainly measured in routine biochemical analysis?
- Inorganic phosphate in serum/plasma. (correct)
- Phospholipids in cell membranes.
- Phosphoric acid in soft tissues.
- Phosphodiesters in DNA and RNA.
Which compound stores biochemical energy in cells?
Which compound stores biochemical energy in cells?
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What percentage of total phosphorus is found in the serum/plasma?
What percentage of total phosphorus is found in the serum/plasma?
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Which element is a component of phosphate?
Which element is a component of phosphate?
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Study Notes
Phosphorus and Phosphate
- Phosphorus is an abundant element, widespread in its distribution.
- The adult human body contains approximately 560-850 g of phosphorus.
- Phosphate compounds participate in many crucial biochemical processes and are found everywhere in living cells.
Biochemical Importance
- Genetic materials DNA and RNA are complex phosphodiesters.
- Most coenzymes are esters of phosphoric or pyrophosphoric acid.
- The most important reservoirs of biochemical energy are ATP, creatine phosphate, and phosphoenolpyruvate.
Forms of Phosphate in the Body
- 85% of phosphate is found in bones and teeth in the form of hydroxyapatite (Ca10(PO4)6(OH)2).
- 15% is located in cell membranes and intracellular fluid in soft tissues as organic phosphate, incorporated into phospholipids, nucleic acids, and high-energy compounds.
- Less than 1% of total phosphate is found in serum/plasma as inorganic phosphate, which is measured in routine biochemical analysis.
Phosphorus and Phosphate Definitions
- Phosphorus is an element (P).
- Phosphate is a compound that contains phosphorus (PO43-).
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