Talk:Histamine receptor

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Histamine receptor discrepancy[edit]

How can the same H1 type receptors cause both smooth cell constriction (bonchoconstriction) and smooth cell relaxation (systemic vasodilatation)? Ca2+ signalling cause constriction. I think the vasodilatation is caused by the H2 receptors. Vasodilatation should be removed from the H1 part of the table. 193.6.168.249 (talk) 14:03, 16 December 2016 (UTC)