Bronchioles..
The smallest tube in the lungs is the Bronchus
No, as they have no lungs or nasal passages.
I believe the smallest are the alveoli (air sacs), since there are millions of them in the lungs.
YES
Passages through which air enters the lungs is called the bronchi which branch off of the trachea.
bronchodilator
No, clams don't have nasal passages or lungs.
The respiratory system
Alveoli
These are called alveoli.The bronchi (or air passages) continually divide into smaller and smaller bronchi in the lungs, until they become bronchioles. The very smallest of the bronchioles end in a tiny sac or 'balloon' called alveoli.The alveoli are surrounded by a dense network of capillaries which allows the exchange of gases between the lungs and the bloodstream.alveoli
drop dead
Alveoli