Abstract:The release of inorganic phosphate (Pi) from the cross-bridge is a pivotal step in the cross-bridge ATPase cycle leading to force generation. It is well known that Pi release and the force-generating step are reversible, thus increase of [Pi] decreases isometric force by product inhibition and increases the rate constant kTR of mechanically-induced force redevelopment due to the reversible redistribution of cross-bridges among non-force-generating and force-generating states. The experiments on cardiac myofibr… Show more
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