THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -One of the most important factors influencing airway resistance is the diameter of the airway. In general, the opposition of flow can be described as the pressure divided by the rate of flow (R = change in P/V).

Detailed explanation-2: -For example, in asthma attacks the bronchioles spasm and constrict, which increases resistance. Emphysema also increases airway resistance because the lung tissue becomes too pliable and it the airways become more difficult to hold open by the flow of air.