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Questions and Answers
What is the percentage of body iron held within hemoglobin?
What is the percentage of body iron held within hemoglobin?
- 70% (correct)
- 80%
- 50%
- 60%
How is body iron primarily regulated?
How is body iron primarily regulated?
- Excretion
- Absorption (correct)
- Oxidation
- Reduction
What is the ionic form and number of molecules of iron that bind to one molecule of apotransferrin?
What is the ionic form and number of molecules of iron that bind to one molecule of apotransferrin?
- Fe3+ - 2 molecules
- Fe2+ - 1 molecule
- Fe3+ - 1 molecule (correct)
- Fe2+ - 2 molecules
How is individual cells acquire iron?
How is individual cells acquire iron?
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What is the essential metabolic process in which iron participates?
What is the essential metabolic process in which iron participates?
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Study Notes
Iron Regulation and Function
- Approximately 65% of the body's iron is held within hemoglobin, a crucial component of red blood cells.
- Body iron is primarily regulated by the absorption of dietary iron in the duodenum, which is influenced by the iron stores and the need for erythropoiesis.
- One molecule of apotransferrin binds to two molecules of iron in the ferric (Fe3+) ionic form.
- Individual cells acquire iron through the importation of iron-bound transferrin, which is then released from transferrin and transported into the cell through the actions of transferrin receptors.
- Iron is an essential participant in the metabolic process of oxygen transport, playing a critical role in the function of hemoglobin and myoglobin.
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