Show the mechanism for each of the following pericyclic reactions. 
Definitions:
Bronchial Asthma
A chronic inflammatory disease of the airways that causes episodes of wheezing, breathlessness, chest tightness, and coughing.
Allergic Hypersensitivity
An exaggerated or inappropriate immune response triggered by an antigen, leading to adverse reactions upon exposure.
Airway Reactivity
Airway reactivity describes the sensitivity of air passages in the lungs to various stimuli, often leading to constriction and breathing difficulties as seen in asthma.
Heimlich Maneuver
A first aid procedure used to treat upper airway obstructions (or choking) by foreign objects.
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