Q.7
Do the hypercapnia-induced decrease of intra- and extra-cellular pH values compensate by the increase in one of the
following molecules/ions?
- Branchial Compensation of Respiratory Acidosis:
- Environmental hypercapnia (elevated water $CO_2$) causes hydration of $CO_2$ in fish blood, producing carbonic acid and driving down intracellular and extracellular $\text{pH}$ (respiratory acidosis):
- Fishes compensate by actively excreting $H^+$ ions and retaining/accumulating bicarbonate ions ($HCO_3^-$) via branchial gill epithelia exchangers ($Na^+/H^+$ and $Cl^-/HCO_3^-$), elevating plasma bicarbonate to restore systemic blood $\text{pH}$.
- Correct Option: Option 4 (Bicarbonate concentration).
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