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 an 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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