A flap of cartilage that closes the trachea during swallowing
A cartilaginous box that has a number of ligaments stretched across it. These are known as the vocal cords.
A flexible air way that is supported by horse- shaped pieces of cartilage.
The trachea is made up of smooth muscle lined with cliated epithelium and goblet cells.
The trachea divide into two bronchi, each leading to one lung. The structure of the bronchi resembles that of the trachea.
The branching sub-divisions of the bronchi. The larger bronchioles are supported by cartilage, but this gradually disappears as bronchioles get smaller. Their walls are made of smooth muscle lined with cuboidal epithelial cells. Their walls are made of smooth muscle-lined with cuboidal cells.
Minute air-sacs with a diameter between 100 um and 300 um. They contain some collagen and elastic fibres, and are lined with squamous epithelium