Interaction between drugs and potassium-rich solutions in producing contraction in bovine tracheal smooth muscle: studies in normal and calcium-depleted tissues.


1. The contracture normally induced in isolated bovine tracheal smooth muscle by potassium-rich solution was abolished by removal of the extracellular calcium. The contraction returned when calcium was added to the solution in a concentration greater than 0.05 mmol/l. 2. The amplitudes of the potassium-contracture, and of the contractile responses to… (More)


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