Multiple choice

Nephron is a structural and functional unit of kidney. Which of the following statements characterises the excretion of acid by the mammalian nephron?

  1. Acid can be excreted as NH4+ ions.

  2. Acid excretion mainly occurs in the early nephron.

  3. In the distal nephron, secreted hydrogen ions mainly contribute to bicarbonate reabsorption.

  4. Sodium phosphate is a urinary base.

  5. Human urine is usually alkaline in nature.
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A Correct answer
Explanation

When hydrogen ions are secreted by the tubules, they can combine with NH3 to form NH4+ and so can be excreted as NH4+.

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