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Abstract
Experiments were conducted to determine if ethylenediaminetetraacetic acid (EDTA) was essential for the acetylcholine (ACh)-induced relaxation of blood vessels. Isolated rabbit aortic rings were prepared for recording isometric tension. They were maintained in Krebs bicarbonate solution with various concentrations of EDTA. With EDTA concentrations of 0 or 0.003 mM, no ACh-induced relaxation was observed; only the contractile effect of ACh was seen. With 0.03 and 0.30 mM EDTA, ACh induced relaxation with EC50 values of 0.11 and 0.098 microM, respectively. Under the experimental conditions used, EDTA was essential for demonstration of ACh-induced relaxation.
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