Pulmonary Ventilation

Boyle’s law explains ventilation (also referred to as pulmonary ventilation). It states that volume is inverse to pressure.
Ex Phys Home
Inspiration: Active Process Expiration: Passive Process
External intercostal muscles contract, expanding rib cage External intercostal muscles relax, reducing rib cage
Diaphragm contracts, expanding the thoracic cavity Diaphragm relaxes, reducing the thoracic cavity
Volume Increases/Pressure Decreases Volume Decreases, Pressure Increases
AIR FLOWS INTO THE LUNGS AIR FLOWS OUT OF LUNGS
With asthma the muscles surrounding the bronchioles constrict or contract AND the lining of the bronchiole swells due to inflamation. This restricts the airway passage and can be triggered by house dust, dander, tobacco, pollen, furnace air, animal fur, viral infections and colds.
With exercise-induced asthma (or exercise-induced bronchoconstriction) there is a constriction of the bronchioles, however there is NO swelling in the inner lining. EIA usually occurs 5 to 10 minutes into the recovery from exercise. The theory of EIA is that the cold air coming over the warming tissue linings results in a constriction response of the bronchioles.
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