Connective tissue: The lung has interstital tissue which connects and hold the lungs together like a net. The bronchial tubes connect to the air sacs. Oxygen must pass through the bronchial tubes, air sacs and interstitium to oxygenate the blood. In ild the insterstitum becomes inflamed and scarred due to inhaled substances, drugs, arthritis, infection, cancer, or unknown -- can lead to decreased oxygen level.
Answered 11/15/2018
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