MYOfibril yarn

Region in center of H zone that contains proteins that hold thick filaments together at center of sarcomere.

• Z discs

• A band

• I band

• H zone

• M line

Narrow region in center of each A band that contains thick filaments but no thin filaments.

• Z discs

• A band

• I band

• H zone

• M line

Lighter, less dense area of sarcomere that contains remainder of thin fi laments but no thick filaments.

• Z discs

• A band

• I band

• H zone

• M line

Dark, middle part of sarcomere that extends entire length of thick filaments and includes those parts of thin fi laments that overlap thick fi laments

• Z discs

• A band

• I band

• H zone

• M line

Narrow, plate-shaped regions of dense material that separate one sarcomere from the next

• Z discs

• A band

• I band

• H zone

• M line

Name the following parts (light blue)

Name the following parts (dark blue)

Name the following parts (peach)

Name the following parts (pink)

Name the following parts (yellow green)