Bands that make up a sarcomere are 2bands also known as light bands which are mainly comprised of ( AKA thin filaments) and 1 band in the center also known as the dark band which is mainly comprised of (AKA Thick filaments). On either end of the sarcomere there is a Disk.

the right side of the picture going down is:

polymerase

protein

transport vesicle

modified protein

the left side of the picture going down is:

dna helix

single-stranded rna

endoplasmic reticulum

ribosome

golgi apparatus

protein released from vesicle

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sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.