What are anticholinergics commonly used for in respiratory therapy?

Anticholinergics are commonly used in respiratory therapy primarily for their ability to provide bronchodilation and reduce mucus secretion. They work by blocking the action of acetylcholine, a neurotransmitter that can stimulate bronchoconstriction and increase secretions in the airways. By inhibiting these effects, anticholinergics help to relax the smooth muscles of the airways, resulting in widened air passages which makes breathing easier for patients with conditions such as asthma or chronic obstructive pulmonary disease (COPD). Additionally, by reducing mucus production, anticholinergics help to clear the airways and improve airflow, further enhancing respiratory function.

The other choices do not accurately represent the primary functions of anticholinergics in respiratory therapy, as they do not focus on enhancing lung capacity, alleviating chest pain, or enhancing oxygen absorption directly. These actions are typically associated with different classes of medications or therapies targeted at specific symptoms or underlying conditions.