"arterial O2 saturation. Cheyne-Stokes breathing occurs frequently during sleep, especially in subjects at high altitude, as in this example. In the presence of preexisting hypox-emia secondary to high altitude or other causes, the periods of apnea may result in further falls of O2 saturation to dangerous levels. Falling Po2 and rising Pco2 during the apnea intervals ultimately induce a response and breathing returns, reducing the stimuli and leading to a new period of apnea.
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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.