Okay, technically, that's not one word with a definition to follow. And obviously I don't do this every day. It just sounds better than: "every now and again..." I have been interested in the lymph system lately, and so the following "word a day's" will be excerpts from my Italian doctor-written Atlas of Anatomy. Some of the mistranslations are fun, but will be corrected by me for the purpose of clarity. I will be skipping over the circulation of blood, even though the two systems run alongside each other, and can hardly be separated, as we read about in Word a Day 6 on Hemoglobin. Excerpted from the Chapter on "The Circulatory and Lymphatic System" ...While the blood system is a closed circuit where blood circulation takes place thanks to continuous pressure produced by the contractions of the heart, the lymphatic system is an open circuit, which "passively" drains the interstitial fluid from the tissues. The lymph, pushed by the muscular movements of the body, runs through the lymphatic vessels, from the periphery toward the main ducts that pour into the large veins, at the base of the neck. The blood system is made up of the heart, and of different size and different funtional vessels (arteries, veins, capillaries), while the lymphatic system has lymphatic nodules or lymph nodes running along its entire course. They can be very small organs (some of them even microscopic, located at the periphery and called "interrupting lymph nodes"), or they can be very large ones, often grouped into lymph centers, where the lymph of big areas of the body meets. In fact, the circulatory and the lymphatic systems are not only similar because they both collect and distribute vital substances, but also because they protect the body. There are many cellular components (macrophagocytes, lymphocytes T and B, and platelets) and many substances dispersed inside the blood and the lymph (antibodies) which are necessary to "cicatrize?" wounds, to protect from protozoans, bacterial and viral infections." Okay, this is me, now: I think I now have a new term for my kids--"interrupting lymph nodes." So, this helps me to understand something that I once read about why yoga has more benefits than just the muscular stretching. The lymph system does not have a master organ to regulate the circulation of its fluid. It relies upon the various movements we make for this. So, now I'm left with this conundrum-- when I am physically active, I swell up the next day, especially around my neck, which now makes sense. It would seem that the lymph is failing to drain properly into the main veins located near the neck and collarbone. (I wish I could show you guys all the cool illustrations that go with this description). So note, the lymph system does not take junk out of the blood stream and direct it out through our skin, but the other way around. So, I don't understand how to correct this problem, if movement is both the cause and the solution. Any ideas?