Neco 2023 Biology Question 45
Practice objective / multiple choice question 45 from the 2023 Neco Biology examination.
The normal blood calcium concentration in a fish is 2.5 mM. A sudden loss of calcium reduces the concentration to 2.1 mM. The parathyroid hormone (PTH) response restores calcium by an amount given by \(\Delta[\text{Ca}^{2+}] = k \times (C_{\text{desired}} - C_{\text{current}})\) where the gain constant \(k = 0.6\). Assuming the response occurs instantly, what is the new calcium concentration after the feedback response? Explain why this constitutes a negative‑feedback mechanism.
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About This Question
This is Neco 2023 Biology Question 45. It is one of the objective questions from the 2023 Neco Biology examination.
Difficulty level: Medium .
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