membranes must be thin for efficient diffusion of gasses.
surfactant
They are called alveoli.
They are called alveoli.
Alveoli
They are called alveoli.
the thin-walled sacs in the lungs are the alveoli. they are tiny are sacks in your lungs.
the thin-walled sacs in the lungs are the alveoli. they are tiny are sacks in your lungs.
the thin-walled sacs in the lungs are the alveoli. they are tiny are sacks in your lungs.
Trachea have cartillage rings which support it. And the Alveoli has large surface area for diffusion and its moist and thin.
Alveoli
It allows for rapid diffusion of gasses.
Lungs A +