Neco 2018 Biology Question 35

Practice objective / multiple choice question 35 from the 2018 Neco Biology examination.

Neco 2018 Biology Objective / Multiple Choice Medium Difficulty
Question 35 NECO • 2018 • BIOLOGY • objective

A simple reflex arc consists of a sensory neuron (0.5 m long, conduction velocity 80 m·s\(^{-1}\)), an interneuron (0.2 m long, conduction velocity 20 m·s\(^{-1}\)) and a motor neuron (0.4 m long, conduction velocity 60 m·s\(^{-1}\)). Each synapse introduces a delay of 0.5 ms.\n\n(a) Calculate the total neural transmission time for the reflex (excluding central processing).\n(b) If the observed reaction time for the reflex is 0.15 s, estimate the time taken for central processing.\n(c) Which segment of the neural pathway contributes the greatest proportion of the transmission time?

Answer Options

A. Total transmission time = 0.020 s; central processing time = 0.130 s; the sensory neuron segment contributes the greatest proportion.
B. Total transmission time = 0.025 s; central processing time = 0.125 s; the interneuron segment contributes the greatest proportion.
Correct Answer C. Total transmission time = 0.024 s; central processing time = 0.126 s; the interneuron segment contributes the greatest proportion.
D. Total transmission time = 0.030 s; central processing time = 0.120 s; the motor neuron segment contributes the greatest proportion.
Correct Answer
C
Correct Option:
Total transmission time = 0.024 s; central processing time = 0.126 s; the interneuron segment contributes the greatest proportion.

About This Question

This is Neco 2018 Biology Question 35. It is one of the objective questions from the 2018 Neco Biology examination.

Difficulty level: Medium .

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