Multiple choice

Calcitonin produces all but one of the following. Identify the odd one out.

  1. It rapidly raises plasma calcium levels.

  2. It lowers plasma inorganic phosphate levels.

  3. It does not affect plasma magnetism levels.

  4. It inhibits bone resorption.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Calcitonin LOWERS plasma calcium levels by inhibiting bone resorption (osteoclast activity) and increasing calcium excretion by kidneys. It also lowers plasma phosphate. The question asks for the 'odd one out' - option A claims calcitonin raises calcium, which is incorrect and therefore the exception. However, the phrasing is confusing since calcitonin doesn't do any of these directly - it inhibits bone resorption which indirectly lowers calcium.

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