ok, think of your lungs as a cluster of grapes hanging upside down. The smallest branches are called bronchioles . At the end of each bronchiole is an "air sac" called alveoli .
Your question is unclear. Are you asking what does the most in the respiratory system , then tiny little sacs called the alveoli do.
Cilia are the tiny hairs that sweep dust and dirt out of the respiratory system.
some things that are part of the lungs and respiratory system
The insect respiratory system operates by passive exchange of gasses through tiny holes called spiracles in their abdomen.
alveoli
"Our solar system." The "part of our galaxy" that's in our solar system is the solar system.
Some of the components of the respiratory system are the major structures like the throat, windpipe, and lungs. The other parts are smaller things like the alveoli, which are tiny sacs in the lungs where over a million of them work to transfer oxygen and carbon dioxide in and out of blood.
alveolus (tiny air sacs arranged in clusters in the lungs, in which the exchange of oxygen and carbon dioxide takes place.)
The respiratory system absorbs oxygen. Oxygen is inhaled through the nose and mouth, passes through the trachea, and enters the lungs where it is absorbed into the bloodstream through tiny air sacs called alveoli.
The cilia are tiny hair-like structures found on the surface of some cells, like those in the respiratory tract. They beat in a coordinated manner to sweep mucus and debris out of the respiratory system.
Alveoli
alveoil