Figure 6: The intestinal tract as a transfer system. (a) A sudden substance shooting an impulse e1 (t) similar to the delta function δ(t) is injected into the bloodstream intravenously. The response is r1 (t) = h1 (t) (the impulse response), with h1 being the blood transfer function in the s domain. (b) An oral amount e2 (t), in a way similar to the delta function, of the same substance is ingested by the subject, producing a response r2 (t) between the first and the second block (obviously impossible to record) that acts as input to the intestines. The final response is r3 (t), detectable at the lower right-hand corner of the figure, where the line wave resembles what is expected after crossing the intestines.
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