Waec Model Questions Vol1 2022 Biology Question 31

Practice objective / multiple choice question 31 from the 2022 Waec Model Questions Vol1 Biology examination.

Waec Model Questions Vol1 2022 Biology Objective / Multiple Choice Medium Difficulty
Question 31 WAEC_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • objective

A researcher administers a drug that selectively blocks the release of acetylcholine at neuromuscular junctions. The subject experiences rapid muscle fatigue during sustained activity (e.g., holding a weight for a long time) but can still perform brief, high‑intensity movements (e.g., a short sprint). Identify which component of the coordination system is primarily affected and explain why brief movements are still possible.

Answer Options

A. The somatic nervous system (neuromuscular junction) is primarily affected; acetylcholine blockade impairs brief movements, but sustained contraction can still occur using pre‑stored calcium and ATP.
B. The autonomic nervous system (sympathetic division) is primarily affected; acetylcholine blockade impairs sustained contraction, but brief movements can still occur using pre‑stored calcium and ATP.
Correct Answer C. The somatic nervous system (neuromuscular junction) is primarily affected; acetylcholine blockade impairs sustained contraction, but brief movements can still occur using pre‑stored calcium and ATP.
D. The somatic nervous system (muscle spindle) is primarily affected; acetylcholine blockade impairs sustained contraction, but brief movements can still occur using pre‑stored calcium and ATP.
Correct Answer
C
Correct Option:
The somatic nervous system (neuromuscular junction) is primarily affected; acetylcholine blockade impairs sustained contraction, but brief movements can still occur using pre‑stored calcium and ATP.

About This Question

This is Waec Model Questions Vol1 2022 Biology Question 31. It is one of the objective questions from the 2022 Waec Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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