title: Transient length responses of heart muscle in Ba2+-contracture to step tension reductions.
abstract: The transient length response of the cat papillary muscle in Ba2+-contracture to step tension reduction was found to comprise four different phases. It is tentatively suggested that the transient response is mostly determined by the kinetics of the attachment and detachment of cross-bridges between actin and myosin filaments, which vary appreciably with activation level of the muscle.
mesh_terms: D000818:Animals; D001464:Barium / Q000494:pharmacology*; D002415:Cats; D066298:In Vitro Techniques; D009126:Muscle Relaxation / Q000187:drug effects; D009200:Myocardial Contraction / Q000187:drug effects*; D013696:Temperature
chemical_list: D001464:Barium