"I went to school for about 2 years on a technical course, and I learned a lot. I learned about air mixture ratios and all the stuff; I learned how to draw blood."

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The responsibility for maintaining the composition of the blood in respect to other constituents devolves largely upon the kidneys. It is no exaggeration to say that the composition of the blood is determined not by what the mouth ingests but by what the kidneys keep; they are the master chemists of our internal environment, which, so to speak, they synthesize in reverse.

— Homer Smith