the aveoli
Air sacs are part of the respiratory system
Respiratory. They are the air sacs in your lungs.
Your question is unclear. Are you asking what does the most in the respiratory system , then tiny little sacs called the alveoli do.
This system is called the respiratory system. It exchanges oxygen that the cells need to make energy for carbon dioxide which is a waste product that the cells make.
Bronchioles are part of the respiratory system and branch from the bronchus. Air from the bronchus enters the terminal bronchioles that terminate in air sacs known as alveoli.
The respiratory system. The alveoli are air sacs in the lungs.
air sacs
The respiratory system
The respiratory system. The alveoli are air sacs in the lungs.
where there's air in your intestines
alveoli
Air sacs of the lungs