Because you want as much air to dissolve into your blood as possible. If you have loads of tiny air sacks then the rate that air is dissolved into your blood is greatly improved. If you ever get a chance to see a dissection of a lung then i recommend it, it makes understanding the lungs a lot easier.
To increase the total surface for gas exchange.
To better distribute the oxygen over a wider area.
These are the bronchi. (One bronchus, two bronchi).
bronchioles
Bronchi are the two tubes that branch off into each lung.
major bronchi
The tubes that connect the bronchi with the alveoli are the bronchioles.
By I only ought be able skills and tomorrow morning to be able skills
Starting from the left and right bronchi, bronchus for singular, these branch down from the trachea. Then the bronchi branch off to smaller bronchi and these branch off to bronchioles. The bronchioles contain air sacs at the end called alveoli and alveolus for singular.
The trachea branches into two primary bronchi which farther branch into secondary bronchi.
The two branching tubes in the respiratory system are the bronchi. They are branches of the trachea.
The bronchial tubes (or bronchi) are the large tubular structures within the lungs. These carry air into the lungs from the trachea. They branch into smaller tubes called bronchioles, and then to the smallest tubes that contain the alveoli (air sacs) of the lungs.
Bronchi
Bronchi