Igcse Model Questions Vol1 2020 Biology Question 23
Practice objective / multiple choice question 23 from the 2020 Igcse Model Questions Vol1 Biology examination.
In a simple stretch reflex the sensory (afferent) neuron is \(0.8\) m long and conducts impulses at \(80\) m s⁻¹. The motor (efferent) neuron is \(0.6\) m long and conducts at \(60\) m s⁻¹. The synaptic delay in the spinal cord is \(0.5\) ms and the neuromuscular junction adds a further \(0.3\) ms. Muscle contraction occurs \(20\) ms after the motor impulse reaches the muscle. What is the total time from the initial stretch to the start of muscle contraction? Give your answer in milliseconds.
Answer Options
About This Question
This is Igcse Model Questions Vol1 2020 Biology Question 23. It is one of the objective questions from the 2020 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Medium .
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.