sliding filament mechanism

Figure 1: The autonomic nervous system. Actions on secretory functions (heart diagrams indicate release into the circulation). Sympathetic actions on the left and parasympathetic actions on the right. Solid arrows: stimulation (contraction or secretion); broken arrows: inhibition.

sliding filament mechanism

the process by which striated muscles change length, the overlap of thin and thick filaments increasing as the muscle shortens and decreasing as it lengthens. Describes the manner in which these length changes occur, but is not an explanation of the mechanism of active shortening. See also cross-bridge (XB), muscle fibre, myofibrils; Figure 1.