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The lymphatic system

Lymph travels around the body through a network of vessels in much the same way that blood travels around the body through the blood vessels. Whereas the blood carries nutrients and other substances into our tissues, the lymph vessels drain fluid from the tissues and transport it to the lymph nodes. These small gland-like masses of tissue filter out and destroy bacteria and other harmful substances. The bigger lymph vessels then carry the cleaned fluid back to the vein called the superior vena cava, where it enters the blood stream.

The lymph or lymphatic system is an important part of our body's system to defend us against infections.