What is the purpose of "postural drainage" in healthcare?

The purpose of postural drainage in healthcare is to help clear mucus from the lungs. This technique involves positioning the patient in specific ways that utilize gravity to facilitate the mobilization and drainage of secretions from the bronchial tree and lung spaces. By effectively draining mucus, postural drainage can enhance respiratory function and improve the patient's ability to breathe more easily.

The other options, while related to respiratory or overall health, do not accurately describe the primary intent of postural drainage. Strengthening lung capacity through exercise is more aligned with physical fitness activities, while preventing dehydration and assisting with sleep apnea address different aspects of health management not directly linked to mucus clearance from the lungs.