- Created by: daisy yemm
- Created on: 21-02-19 14:37
The sliding filament theory
What is the sliding filament theory?
Muscle contraction is explained by the sliding filament theory...
- This is where myosin and actin filaments slide over one another to make the sarcomeres contract - the myofilaments themselves don't contract.
- The simultaneous contraction of lots of sarcomeres means the myofibrils and muscle fibres contract.
- During contraction, the sarcomere gets shorter as the Z-lines get closer together. The I-band and H-zones get shorter, where as the A-band stays the same length.
- Sarcomeres return to their original length as the muscle relaxes.
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