Igcse Model Questions Vol1 2023 Biology Question 8
Practice objective / multiple choice question 8 from the 2023 Igcse Model Questions Vol1 Biology examination.
In a simple reflex arc, the sensory neuron is \(0.8\) m long and is myelinated, giving a conduction speed of \(120\) m s\(^{-1}\). The motor neuron is \(0.6\) m long and is unmyelinated, with a speed of \(30\) m s\(^{-1}\). Each of the two synapses in the arc introduces a delay of \(0.5\) ms. The total measured reaction time from stimulus to muscle contraction is \(35\) ms. What percentage of the total reaction time is accounted for by the nerve conduction (i.e., the time taken for the impulses to travel along the two neurons)?
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This is Igcse Model Questions Vol1 2023 Biology Question 8. It is one of the objective questions from the 2023 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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