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Questions and Answers
What percentage of HCO3- is reabsorbed by the distal tubules in the kidneys?
What percentage of HCO3- is reabsorbed by the distal tubules in the kidneys?
How is HCO3- primarily reabsorbed in the tubules?
How is HCO3- primarily reabsorbed in the tubules?
What happens when HCO3- is filtered in excess of H+ available?
What happens when HCO3- is filtered in excess of H+ available?
What percentage of HCO3- is typically reabsorbed from the tubules?
What percentage of HCO3- is typically reabsorbed from the tubules?
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Why is HCO3- reabsorbed slightly less effectively in the distal tubules?
Why is HCO3- reabsorbed slightly less effectively in the distal tubules?
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Study Notes
Kidney HCO3 Reabsorption
- 85% of HCO3- is reabsorbed in the proximal tubules, 15% in distal tubules.
- Tubules have limited permeability to HCO3-.
- Reabsorption primarily occurs as CO2.
- HCO3- combines with H+ to form carbonic acid.
- Carbonic acid dissociates into water (H₂O) and CO2.
- CO2 diffuses back into the extracellular fluid (ECF).
- Nearly all filtered HCO3- is normally reabsorbed.
- Excess HCO3- (beyond available H+) is excreted in urine.
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Description
This quiz explores the processes involved in bicarbonate (HCO3-) reabsorption in the kidneys. It focuses on the roles of the proximal and distal tubules, as well as the chemical reactions that facilitate the reabsorption of bicarbonate. Understand how the kidneys maintain acid-base balance through HCO3- management.
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