PLTW Medical Detectives Practice Exam

Understanding body heat levels is essential: the amount of heat the body produces and loses determines what we measure as temperature. Temperature is the reading that reflects how hot or cold the body is, balancing metabolic heat production with heat loss to the environment through the skin, lungs, and sweating. The body keeps this measurement within a narrow range (about 37°C or 98.6°F on average) through mechanisms controlled by the hypothalamus acting like a thermostat. When metabolic activity increases heat production and loss mechanisms can’t keep up, temperature rises, leading to fever. If heat loss outpaces production, temperature drops. Other terms describe different bodily functions, not heat balance. Pulse measures heart rate, blood pressure reflects the force of blood in the arteries, and respiratory rate counts breaths per minute.