Tiny tubes inside our bodies are what connects the bronchi to the alveoli.
Also the tubes that are attached to the outer walls of alveoli are many tiny blood vessels called capillaries.
Air is inhaled and travels through into the lungs, bronchi, bronchioles, and finally into the alveoli.
Your bronchi, lungs and alveoli and other vessels and tubes play a very important role in keeping you alive and allowing you to breathe.
Your body gets the oxygen from the air you breathe through your nose and mouth and then goes through your lungs, bronchi, alveoli and much more.
Then you you exhale the air again and breathe in the air.