How do muscles work with the skeleton to produce movement in sport?
The major voluntary muscles, the three muscle types, antagonistic muscle pairs, and the characteristics of fast and slow twitch muscle fibres.
A focused answer to Edexcel GCSE PE on the muscular system: the major voluntary muscles, the three muscle types, how antagonistic pairs create movement, and the characteristics of slow twitch (type I) and fast twitch (type IIa and IIx) fibres.
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What this dot point is asking
Edexcel wants you to locate the major voluntary muscles, name the three muscle types, explain how antagonistic pairs produce movement, and describe the characteristics of slow and fast twitch muscle fibres, applied to sport.
The major voluntary muscles
The three muscle types
Antagonistic pairs
The roles swap depending on the movement. In the upward phase of a biceps curl (flexion) the biceps is the agonist; in the controlled lowering phase (extension) the triceps becomes the agonist. The exam often asks you to name the agonist and antagonist for a named action, so always identify which muscle is shortening to cause the movement, that is the agonist.
Fast and slow twitch fibres
The proportion of each fibre type is largely inherited, which is part of why elite sprinters and elite endurance athletes are built so differently. Training can shift the characteristics a little (for example endurance training improves the fatigue resistance of type IIa fibres), but you cannot turn a slow twitch fibre into a fast twitch one. Matching the dominant fibre type to the sport is therefore a major factor in performance.
Exam-style practice questions
Practice questions written in the style of Pearson Edexcel exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Edexcel 20182 marksName the antagonistic pair acting at the elbow during the upward phase of a biceps curl, and state which muscle is the agonist.Show worked answer →
A Component 1 short-answer question. One mark for the pair, one for the agonist.
Award marks for: the biceps and triceps are the antagonistic pair at the elbow; during the upward phase (flexion) the biceps is the agonist (it contracts to produce the movement) and the triceps is the antagonist (it relaxes and lengthens).
A common error is naming the agonist as the muscle that relaxes. The agonist is always the one shortening to cause the movement.
Edexcel 20224 marksA 100 m sprinter and a marathon runner rely on different muscle fibre types. Using your knowledge of fibre characteristics, explain which fibre type suits each athlete.Show worked answer →
A Component 1 application question, marks for matching fibre characteristics to each event.
Award marks for: the sprinter relies on fast twitch fibres (type IIx) which contract quickly and powerfully but fatigue fast, ideal for the short, explosive 100 m; the marathon runner relies on slow twitch fibres (type I) which contract slowly with less force but resist fatigue and use oxygen efficiently, ideal for the long aerobic race.
Top answers tie the characteristic to the demand: speed and power for the sprint, fatigue resistance for the marathon.
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Sources & how we know this
- Pearson Edexcel GCSE (9-1) Physical Education (1PE0) specification — Pearson Edexcel (2016)