Respiratory tract

 The Respiratory Tract is lined with epithelium which move the mucus up towards the mouth in a sweeping motion. Once the mucus has reached the mouth it is swallowed via the oesophagus.

Structure

The nasal cavity flows through to the pharynx, then the larynx, followed by the lower respiratory tract. This flows through to the trachea which divides into the bronchi, which further divide into bronchioles.