title: Force:velocity relationship and helical shortening in single smooth muscle cells.
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D002024:Bufo marinus; D066298:In Vitro Techniques; D007551:Isotonic Contraction; D007700:Kinetics; D009119:Muscle Contraction; D009130:Muscle, Smooth / Q000502:physiology*