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A Band

Length does not change when sarcomere shortens

A Band

This area is the length of thick filaments

M Line

Center point of attachment for thick filaments

H Zone, I Band

Length decreases when sarcomere shortens

I Band

This area only contains thin filaments

Z Disc

Point of attachment for thin filaments

H zone

This area only contains thick filaments

A Band

This area contains overlapping thin and thick filaments


The area from Z Disc to Z Disc

H Zone

This area disappears in a fully contracted muscle

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