Igcse Model Questions Vol1 2020 Biology Question 7
Practice objective / multiple choice question 7 from the 2020 Igcse Model Questions Vol1 Biology examination.
In a simple reflex arc, a sensory receptor is located 0.5 m from the spinal cord, and the motor effector muscle is 0.3 m beyond the spinal cord. The sensory (afferent) nerve conducts impulses at \(50\) m s\(^{-1}\) and the motor (efferent) nerve at \(60\) m s\(^{-1}\). At each synapse there is a delay of \(0.5\) ms, and the central processing involves three interneurons, each adding a delay of \(2\) ms. After the motor impulse reaches the muscle, the muscle itself takes \(20\) ms to develop a measurable contraction. Calculate the total time, in milliseconds, from the initial stimulus at the receptor to the onset of muscle contraction.
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About This Question
This is Igcse Model Questions Vol1 2020 Biology Question 7. It is one of the objective questions from the 2020 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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