Task: Metaphors
Come up with an original and creative metaphoric equivalent for the concept described below:
The medulla is part of the brainstem that controls vital functions.  It measures the amount of carbon dioxide in your blood in order to adjust your breathing rate..

Response: emissions testing. Explanation: emissions testing tests the level of what your car puts out and helps to regulate as the medulla regulates carbon dioxide levels
Human originality rating (0-100 scale): 37