Igcse Model Questions Vol1 2024 Biology Question 10
Practice objective / multiple choice question 10 from the 2024 Igcse Model Questions Vol1 Biology examination.
In an experiment a hormone is released into the bloodstream after a stimulus. Its concentration rises linearly from 0 to \(0.8\ \mu\text{g\,ml}^{-1}\) during the first 30 s and then declines exponentially with a half‑life of 45 s. The hormone increases heart rate proportionally: at a concentration of \(0.8\ \mu\text{g\,ml}^{-1}\) the rate rises from 70 bpm to 110 bpm. Calculate the heart rate 90 s after the stimulus.
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This is Igcse Model Questions Vol1 2024 Biology Question 10. It is one of the objective questions from the 2024 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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