Airway resistance is the resistance to airflow within the respiratory airways. It affects how easily one can breathe and is influenced by factors such as airway diameter and lung volume.
Bronchoconstriction: The narrowing of the airways due to contraction of the smooth muscles surrounding them.
Lung Volume: The amount of air that the lungs can hold; larger lung volumes generally lower airway resistance.
Chronic Obstructive Pulmonary Disease (COPD): A group of diseases characterized by increased airflow obstruction and breathlessness.