Final answer:
Anaphylactic shock is the cause of widespread vasodilation, increased capillary permeability, and bronchoconstriction, which can be life-threatening if untreated.
Step-by-step explanation:
Widespread vasodilation, increased capillary permeability, and bronchoconstriction are the result of anaphylactic shock. Anaphylactic shock is a severe allergic response that causes the widespread release of histamines, triggering vasodilation and bronchoconstriction throughout the body. This extreme reaction can lead to respiratory distress and plummeting blood pressure, and if untreated, it can be fatal.