The main stem of this branch of grapes is the trachea. They then branch into smaller ducts called bronchi.
These bronchi/stems branch into even smaller branches/stems called bronchioles.
The bundle of grapes are the alveolar sacs that stem from alveolar ducts/bronchioles.
Each grape represents an alveolus. This is where the gas exchange occurs.
This is the path that air travels when you inhale.