Endurance athletes may suffer from muscle fatigue when contraction of the muscle fibres is disrupted. It is thought that the disruption of the contraction of muscles is caused by a lack of calcium ions within the muscle fibre. Explain why a decrease in calcium ions could disrupt the contraction of muscles. (3) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................
Exam No：WBI1501-que-20241024 Year：2024 Question No：3(a)
Answer:
An explanation that includes three of the following points:
- less calcium ions would bind to troponin (1)
- troponin doesn't change shape (1)
- (therefore) tropomyosin remain in position / less tropomyosin moves (1)
- myosin head cannot bind to \{actin / binding site\} / \{no / less\} formation of (actin-myosin) cross bridges\} (1)
- (therefore) muscles stay relaxed
- less calcium ions would bind to troponin (1)
- troponin doesn't change shape (1)
- (therefore) tropomyosin remain in position / less tropomyosin moves (1)
- myosin head cannot bind to \{actin / binding site\} / \{no / less\} formation of (actin-myosin) cross bridges\} (1)
- (therefore) muscles stay relaxed
Knowledge points:
CH7 – Respiration, Muscles and the Internal Environment
Solution:
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