Sudden and unexpected deaths from respiratory disorders are usually due to infections. Infants and the elderly may succumb to pneumonia very suddenly and without exhibiting significant symptoms. Viral infections of the airway may become secondarily infected by bacteria. An immunocompromised individual with AIDS or cancer readily develops respiratory infections, but these deaths are usually chronic and expected. Rarely, undiagnosed tuberculosis and other contagious diseases not associated with an immunocompromised host still cause unexpected deaths.
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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.