The human body contains three kinds of muscle tissue: skeletal, smooth, and cardiac ... due to alternating filaments that comprise myosin and actin proteins. The dark stripes indicate thick ...

The swinging cross bridge theory for muscle contraction envisages that the myosin cross bridge binds to the actin filament in ... the crystal structure of the smooth muscle myosin motor-domain ...

Myosin II plays the most important role in cellular force generation. Myosin II molecules self-assemble into filaments with different structures depending on myosin II isoforms and other conditions ...

When stimulated by the autonomic nervous system to contract from the release of hormones or other chemical signals, smooth muscle cells shorten via the movement of actin and myosin myofilaments.