What type of inhibitor is noradrenaline in the shown

Last updated: 5/13/2023

What type of inhibitor is noradrenaline in the shown feedback loop below HO Tyrosine NH hydroxylase HO O H L Tyrosine Dopamine B hydroxylase HO HO HO OH Noradrenaline Levodopa NH H Dopa NH decarboxylase HO CO H N Methyl transferase Adrenal medulla HO HO Dopamine OH HO Jox Adrenaline NHMe NH