in each case ( changes in muscle length , changes in intracellular ph , exposure to caffeine or theophylline , exposure to catecholamines , exposure to sulmazole ) , the relationship between the aequorin signal and the developed tension changed in ways that suggest that alterations in myofibrillar ca++ sensitivity play an important role in the responses of intact myocardial cells to these inotropic interventions .
C0026845
muscle
C0225828
myocardial cells