These are white blood cells that help protect the air sacs in your lungs (alveoli) where gas exchange occurs. It’s actually the AMs that trap tar particles in your lungs, causing the black color.

The circulatory system consists of three independent systems that work together: the heart (cardiovascular), lungs (pulmonary ... red blood cells, white blood cells and platelets.

Coughing up white mucus or phlegm ... may suggest fluid buildup in the lungs. Brown This occurs frequently in individuals who smoke and commonly indicates black lung disease, a condition related ...

“When you get a pneumonia parts of your lungs may fill up with fluid and parts that should be black or dark on an X-ray look white.” White lung pneumonia can be caused by a wide range of things.