“…Parasympathetic stimulation also releases insulin, which indirectly mobilizes nitric oxide in the capillaries of skeletal muscle and other peripheral tissues where parasympathetic innervation is absent [331,[338][339][340][341][342][343][344][345][346][347][348]. This explains why insulin prolongs bleeding time, reduces systemic vascular resistance, increases cardiac index, aggravates angina, and counteracts "vasopressor" (fibrinogenic) drugs [307,314,315,332,343,[349][350][351][352]; why allostatic load inhibits insulin effects [353] [366][367][368][369][370][371][372][373][374]. Sudden von Willebrand Factor destruction disrupts capillary gate structure, causing anaphylaxis (angioneurotic edema), wherein vascular resistance and blood pressure drop sharply as blood shifts from larger vessels into capillaries, causing lethal airway edema, while coagulation enzymes and cardiac output remain unaffected [375][376][377].…”