A 35-year-old male patient is lethargic and dehydrated after working at a construction site for 12 hours on a very hot day. You obtain the following vital signs: pulse, 136; respirations, 22 breaths/min; blood pressure, 102/88 mmHg; and SpO2, 100% with supplemental oxygen. As a knowledgeable EMT, you would recognize:

Pathophysiology is a medical science that studies how diseases affect the body's systems. It combines the study of pathology (the causes and effects of disease) and physiology (how the body's systems function).

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