And that's how antibodies end up in the cardiovascular system, in the blood vessels of our body. Now, within these lymph nodes, we also have other wide blood cells, such as macrophages that can engulf any type of pathogenic agent that might be present inside our lymph system. And in this manner, our lymphatic system not only drains our tissue and prevents the build up of fluid inside the tissue, but it also filters our blood. It basically eats up and digests different types of pathogens that are found inside our blood inside these specialized masses of tissue we call lymph nodes. Now, the final portion that I'd like to focus on is how that fluid actually gets into these lymph vessels in the first place and how the limb travels along our limb vessels. So let's take a look at the following diagram.