Because of....... the layer of epithelial cells in the stomach of chordates is not damaged.

Which of the following prevent the collapsing of the trachea?

Given below are two statements regarding the respiratory system of man.
$Statement-I$: Epiglottis prevents the entry of food into the trachea.
$Statement-II$: The internal lining of the trachea is made up of ciliated epithelium only.
In the light of the above statements, choose the most appropriate answer from the options given below:

Which is a common passage for swallowing food and breathing?

What are the characteristics of alveoli?

In the terminal bronchiole,which of the following is present?