Originally posted 2014-12-04 05:49:27. Republished by Blog Post Promoter Optimum respiratory health is not possible without clearing secretions in the airway. Normally, a healthy person can get rid of these secretions in two ways: (1) mucociliary clearance system and (2) coughing. However, presence of diseases such as asthma, cystic fibrosis, cerebral palsy, dystrophy of the...