Abstract:We examined consecutive contractile responses of isolated rabbit pulmonary arteries during repeated exposures to either norepinephrine, histamine or KCl, with washout and relaxation between trials. For each agonist, EC50 values remained constant during consecutive determinations, but the maximum force increased after the first determination. A maximum concentration of norepinephrine or histamine produced a biphasic contraction: the fast phase increased subsequent to the first determination and was r… Show more
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