Figure 1.

Two flow fields for a contracting sarcomere. Shown is a schematic of contracting and lengthening sarcomeres, with red and blue rods representing thick and thin filaments, respectively. Shown is a cross-sectional view of the internal flow field in normalized coordinates during contraction at maximum velocity for the kinematic-based flow field (Model 1, left) and the Darcy flow field (Model 2, right). Both flow fields have a large radial component at the M-line of the sarcomere (z = 0). The peak z-disk velocity is −0.0075. To see this figure in color, go online.