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Two components of sliding velocity Vu(θ) on the interaction unit. Vp(θ) decreases with the increase of the load, while Vn(θ) is independent of the load change. Vp(θ) vanishes around the shortening velocity V(θ)=0.076 Vmax when the sliding direction of the myosin head becomes perpendicular to the direction of the groove of actin strands, i.e., the direction of Vn(θ). Note that Vp(θ) takes the opposite direction with further load increase.
