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Sliding filament theory can be best explained as:
Option: 1
Actin and Myosin filaments do not shorten but rather slide pass each other
Option: 2
When myofilaments slide pass each other, Myosin filaments shorten while Actin filaments do not shorten
Option: 3
When myofilaments slide pass each other Actin filaments shorten while Myosin filament do not shorten
Option: 4
Actin and Myosin filaments shorten and slide pass each other
Answers (1)
- The thick and thin sarcomere filaments do not shorten for a muscle to contract; rather, they slide by one another, causing the sarcomere to shorten while the filaments remain the same length.
- Muscle contraction is the shortening of myofibrils in response to nerve stimulation. During this process, the actin filament slides over the myosin filament and binds to it, forming information actomyosin complexes.
- When a muscle contracts, the distance between the Z lines decreases.
- During contraction, the H zone, which only has thick filaments, and the I band, which only has thin filaments, both get shorter.
- However, the A band does not get shorter and stays the same length.
Hence, the correct answer is option 1).
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