Igcse Model Questions Vol1 2018 Biology Question 10
Practice objective / multiple choice question 10 from the 2018 Igcse Model Questions Vol1 Biology examination.
Blood calcium concentration is normally \(2.5\ \text{mM}\). A drop to \(2.2\ \text{mM}\) triggers secretion of parathyroid hormone (PTH). PTH increases renal calcium reabsorption by 40 % (baseline reabsorption \(0.5\ \text{mM h}^{-1}\)) and stimulates bone to release calcium at \(0.15\ \text{mM h}^{-1}\). Assuming PTH secretion continues until the calcium level returns to the normal set‑point, what will the calcium concentration be after 2 h? (Ignore other regulatory mechanisms.)
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About This Question
This is Igcse Model Questions Vol1 2018 Biology Question 10. It is one of the objective questions from the 2018 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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