Answer:
The lymphatic system drains approximately 10% of the interstitial fluid that has difused out of the capillaries and it transports this back to the subclavian vein. By this way, the lymphatic system also returns albumin, the main protein found in the circulatory system, back into the venous system. Without an efficient lymph system in the lungs, fluid would fill up from diffusing out of the capillary beds creating a longer distance that oxygen gas has to travel from the alveolae to the red blood cells in the venous side of the capillary bed. This is called pulmonary edema and is lethal if bad enough because oxygen fails to successfully difuse to RBCs.
Explanation:
