air sacs
Your respiratory system starts at at your nostrils and mouth, where oxygen goes in. It then passes into the pharynx and trachea and then into the right and left bronchi, which branch into smaller bronchioles, and finally into the millions of tiny alveoli. Actual gas exchange takes place in the alveoli.
A microchip is millions of electronic components placed on a tiny piece of silicon.
flea?
Cilia are the tiny hairs that sweep dust and dirt out of the respiratory system.
the aveoli
alveoli
The tiny sacs within the lungs that increase the respiratory surface are called alveoli. These microscopic air sacs provide a large surface area for gas exchange, allowing oxygen to enter the bloodstream and carbon dioxide to be expelled from the body. The extensive network of alveoli enhances the efficiency of respiration, making it possible for the body to meet its oxygen demands effectively. Each lung contains millions of alveoli, significantly contributing to the overall respiratory surface area.
The tiny lines at the end of characters in some fonts
post office
alveoli
The alveoli in the lungs.
Your question is unclear. Are you asking what does the most in the respiratory system , then tiny little sacs called the alveoli do.