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The Z Lines

Anchors thin filaments, defines ends of the sarcomere

The M Line

Anchors thick filaments, defines the middle of the sarcomere

The I Band

Only thin filaments, straddles Z line

The H zone

Only thick filaments, strattles M line

The A Band

Over lap of thick and thin filaments and the H zone; defined by length of thick filaments

The A band

During a contraction the ___________ stays the same width

The Z lines

During a contraction the ___________ move closer together

The I Band

During a contraction the ___________ gets smaller

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