Waec Model Questions Vol1 2023 Biology Question 8

Practice essay / theory question 8 from the 2023 Waec Model Questions Vol1 Biology examination. This question covers Coordination .

Waec Model Questions Vol1 2023 Biology Essay / Theory

Topic: Coordination

Question 8 WAEC_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • essay

Consider the following statements about the human coordination system: (i) A rapid withdrawal reflex is initiated when a painful stimulus is applied to the skin. (ii) During a graded contraction of the quadriceps, motor units are recruited according to the size principle. (iii) Exposure to a sudden threat triggers a coordinated fight‑or‑flight response involving both the nervous and endocrine systems. Answer the questions that follow:

Question Parts

( a )

Describe the structure of a typical monosynaptic reflex arc and explain how it enables a rapid withdrawal response.

( b )

Explain how the size principle governs motor‑unit recruitment during a graded contraction of the quadriceps.

( c )

A neurotoxin blocks the release of acetylcholine at the neuromuscular junction. Discuss the likely effects of this toxin on the coordination of voluntary movements.

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About This Question

This is Waec Model Questions Vol1 2023 Biology Question 8. It is one of the essay questions from the 2023 Waec Model Questions Vol1 Biology examination.

The question covers Coordination .

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