And eventually that lymph is returned back into our blood system via specific types of veins, as we'll see in just a moment. And the reason we want to return our lymph back into our blood is because we want to ensure that the same volume of blood remains in our cardiovascular system. So once again, the question is what happens to the 10% fluid that remains in the tissue space? If it remains in the tissue space, it will lead to a continual buildup, the process of swelling, the process of edema. And to prevent this from happening, our body uses lymph vessels, shown in green, to drain this fluid out of the interstitial space. Now, the fluid, which is now known as lymph, travels along these venues, along these vessels and eventually connects with these larger vessels we call lymph veins.