Anatomy & Physiology › Section J · The muscular system › Topic J.1
Muscle interactions, fascicles, and levers
No muscle works alone. Every movement is a team effort of muscles that pull, assist, steady and brake, and the way a muscle's fibres are arranged and where it attaches to bone decide whether it is built for force, for speed or for range.
In this topic
- Muscles pull on bones across joints
- Origin and insertion
- Prime movers, synergists and fixators
- Antagonists
- Worked example: roles in a dumbbell curl
- Fascicle arrangements
- Pennate muscles and what arrangement buys
- Bones as levers
- Three classes of lever
- Worked example: holding a weight at the elbow
- Common mistakes to avoid
- Key takeaways
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