The structure which prevents the entry of food into the respiratory tract is

The cartilage of Santorini is a band on which of the following?

The epithelium of the alveoli in the lungs is .......... .

The lungs are covered by a double-layered membrane known as the pleura. What is the inner layer,which is in contact with the lung surface,called?

The thoracic chamber is formed of ........

'$XX$' is a part of the respiratory system that contains $C$-shaped rings of hyaline cartilage. '$XX$' is lined with ciliated,pseudostratified columnar epithelium. Identify '$XX$'.