Interchange
In similar manner, CO2, which is a result of tissue cellular respiration, is also exchanged. The pCO2 changes from 45 to 35 mmHg (6.0 to 4.7 kPa) in the alveoli. The concentration of this gas in the breath can be measured using a capnograph. As a secondary measurement, respiration rate can be derived from a CO2 breath waveform.
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“What men have called friendship is only a social arrangement, a mutual adjustment of interests, an interchange of services given and received; it is, in sum, simply a business from which those involved propose to derive a steady profit for their own self-love.”
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