What these tiny sacs in the lungs do and conditions that can affect them Medically reviewed by Susan Russell, MD Alveoli are ...

The abnormal accumulation of extravascular fluid, pulmonary edema settles in the lung interstitium and alveoli. There, it ...

Oxygen will diffuse from a high concentration at the alveoli in the lungs, to a lower concentration in the red blood cells. This is a passive process, which means it does not need energy.