Figure 1. Schematic of sarcomere structure. Thick filaments consisting of multiple, intertwined myosin hexamers bind and release the actin thin filaments on both sides of an H zone, causing them to slide together in contraction. Thick and thin filaments are attached to the proteins of the Z bands. Also see Figure 2.

Graphic reference: Richfield, David (2014). "Medical gallery of David Richfield". WikiJournal of Medicine 1 (2). DOI:10.15347/wjm/2014.009. ISSN 2002-4436.