Ed was on an international flight, so he was exposed to a long flight at high altitude (even though the airplane cabin is pressurized, it still is at a lower than sea-level pressure). Considering his head cold, his eustachean tube may not have been able to equalize pressure on both sides of the tympanic membrane, leading to pain and reduced hearing. If this is the explanation, the symptoms should resolve with time and the aid of a deconges-tant. Ed's visual problem suggests that he is experiencing presbyopia, which normally begins at about Ed's age.
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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.