HISTOLOGY
URINARY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Na+
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H+
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H2O
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HCO3-
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Detailed explanation-1: -So, the reabsorption of HCO3− can be said to take place in the proximal convoluted tubules of the nephron, in the kidney.
Detailed explanation-2: -Any small amount of bicarbonate which enters the distal tubule can also be reabsorbed. The distal tubule has only a limited capacity to reabsorb bicarbonate so if the filtered load is high and a large amount is delivered distally then there will be net bicarbonate excretion.
Detailed explanation-3: -Calcium. Approximately 7%–10% of filtered calcium is reabsorbed in the DCT. In contrast to other segments of the nephron, which passively reabsorb calcium through paracellular routes, 100% of the calcium that is reabsorbed in the DCT occurs by active transcellular mechanisms.