One of the wonderful things about anatomy is the myriad of "systems" used to classify and teach it. One can pick and choose based on personal biases--it doesn't change the substance, just the form. My Saturday A&P class is discussing the respiratory and urinary systems; lo, and behold, add in the colon and VOILA! you have THE ELIMINATIVE SYSTEM! Who knew? I'll bet anyone anything that a Brit came up with this name and classification.
The respiratory system is "eliminative" in that it excretes carbon dioxide, volatile toxins (such as alcohol) and produces more earthy waste like phlegm, sputum, snot, and boogers.* Most people know what comes out of the urinary system and the colon. :-)
* One of my favorite students at Brooks was the young man who, when asked on an exam for the scientific name for "booger", had the courage of his convictions and gave the correct answer: BOOGER. That boy ended up winning the Principal's Award in 8th grade. Too cool!
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