Biology › Section O · Hormones, bones, and muscles › Topic O.7
Muscle contraction and locomotion
Every step, heartbeat and breath depends on protein filaments sliding past one another. Following a skeletal muscle from the nerve signal to the pull on a bone shows how electricity, calcium and ATP combine to make movement.
In this topic
- From signal to movement
- Inside a muscle fibre
- The sarcomere
- Thick and thin filaments
- The sliding filament model
- Worked example: measuring a contracting sarcomere
- The cross-bridge cycle
- From nerve impulse to calcium
- Controlling force
- Worked example: predicting the effect of a toxin
- Common mistakes to avoid
- Key takeaways
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