<P> The respiratory tract is covered in epithelium , which varies down the tract . There are glands and mucus produced by goblet cells in parts , as well as smooth muscle , elastin or cartilage . Most of the epithelium ( from the nose to the bronchi ) is covered in ciliated pseudostratified columnar epithelium , commonly called respiratory epithelium . The cilia beat in one direction , moving mucus towards the throat where it is swallowed . Moving down the bronchioles , the cells get more cuboidal in shape but are still ciliated . </P>
<P> The respiratory tract is covered in epithelium , which varies down the tract . There are glands and mucus produced by goblet cells in parts , as well as smooth muscle , elastin or cartilage . Most of the epithelium ( from the nose to the bronchi ) is covered in ciliated pseudostratified columnar epithelium , commonly called respiratory epithelium . The cilia beat in one direction , moving mucus towards the throat where it is swallowed . Moving down the bronchioles , the cells get more cuboidal in shape but are still ciliated . </P>
where is cilia found in the respiratory tract
where is cilia found in the respiratory tract
Most of the epithelium ( from the nose to the bronchi )
Most of the epithelium ( from the nose to the bronchi )