Multiple choice

Which of the following statements regarding renal reabsorption of calcium and phosphate is FALSE?

  1. Calcium is reabsorbed but not secreted in the tubules.

  2. Phosphate is secreted but not reabsorbed in the tubules.

  3. Phosphate is reabsorbed with sodium in the proximal tubule.

  4. Calbindins can transport calcium across tubular cells.

  5. The reabsorption of calcium and phosphate ions takes place in the proximal tubules.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

There is no secretion of phosphate and is reabsorbed along the nephron. There is a limit to the amount of phosphate that can be absorbed and if this limit exceeds, the excess phosphate remains in the tubular fluid and is excreted in the urine.

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