Section of lung displays advanced cilia at the front (3-3)

'section of lung' is the definition.
The definition and answer can be both body parts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'displays advanced cilia at the front' is the wordplay.
'displays' becomes 'airs' (air can mean to show or display).
'at the front' says to take the initial letters.
The initial letters of 'advanced cilia' is 'ac'.
'airs'+'ac'='AIR-SAC'

Can you help me to learn more?