Which one serves as a passage for both food and air?

What are the functions performed by the nasal cavity when air passes through it?

Which of the following organs is not a part of the abdominal cavity?

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

The function of tracheal hair (cilia) is to

What is the signet ring-shaped cartilage?