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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