Please use this book essentials of human anatomy and physiology Elaine N. Marieb 2015 Person 13: 978-0-321-91900-7 ISBN.13: 978-0-321-91900-7 For more information please read,https://en.wikipedia.org/wiki/Mucociliary_clearance#:~:text=The%20cilia%20are%20hair%2Dlike,luminal%20surface%20of%20the%20epithelium.&text=The%20mucus%20helps%20maintain%20epithelial,how%20well%20mucociliary%20clearance%20works.