When heat loss mechanisms of the body are unable to keep pace with excess heat production, the result is known as
a. Pyrexia.
b. The plateau phase.
c. The set point.
d. Becoming afebrile.
ANS: A
Pyrexia, or fever, occurs because heat loss mechanisms are unable to keep pace with excess heat production, resulting in an abnormal rise in body temperature. The set point is the temperature point determined by the hypothalamus. When pyrogens trigger immune system responses, the hypothalamus reacts to raise the set point, and the body produces and conserves heat. During the plateau phase, chills subside and the person feels warm and dry as heat production and loss equilibrate at the new level. When the fever "breaks," the patient becomes afebrile.
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