The membrane which immediately covers the lungs is the visceral pleura.
Alveolar sac and alveoli
Pleura
the thin-walled sacs in the lungs are the alveoli. they are tiny are sacks in your lungs.
alveoli
No, pericarditis is inflammation of the sac surrounding the heart. Pneumonitis is inflammation of the lungs.
there are millions of air sacs in your lungs
They are called alveoli.
Alveola sac
In the alveoli (also called air sac) is the capillary-rich sac in the lungs where the exchange of oxygen and carbon dioxide takes place by diffusion. The oxygen poor blood goes from the right ventricle and into the lungs where the co2 is traded for Oxygen in the alveoli and back through the heart and out to the body.
capillaries
I Think You Thinking Of The Alveoli/Alveoli's
it's called, your face.