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Intracellular Ca 2+ transients in cat papillary muscles were detected with the calcium-sensitive bioluminescent protein aequorin and correlated with tension development. The effects of a variety of inotropic interventions are interpreted in terms of their probable effects on Ca 2+ entry, Ca 2+ release, Ca 2+ sequestration, and the Ca 2+ -sensitivity of the contractile apparatus. In contrast to results reported in dog Purkyně strands, the aequorin signals in cat papillary muscles appear to be dominated by release of Ca 2+ from intracellular stores.
Morgan et al. (Thu,) studied this question.