Figure 41-7 gives a quick overview of the manner in which the chemical factors Po2, Pco2, and pH— together—affect alveolar ventilation. To understand this diagram, first observe the four red curves. These curves were recorded at different levels of arterial Po2—40 mm Hg, 50 mm Hg, 60 mm Hg, and 100 mm Hg. For each of these curves, the Pco2 was changed from lower to higher levels. Thus, this
The lower curve demonstrates the effect of different levels of arterial Po2 on alveolar ventilation, showing a sixfold increase in ventilation as the Po2 decreases from the normal level of 100 mm Hg to 20 mm Hg. The upper line shows that the arterial Pco2 was kept at a constant level during the measurements of this study; pH also was kept constant.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.