Which of the following is a sign of severe hypothermia?

Severe hypothermia is characterized by a significant drop in body temperature, leading to various physiological changes. One of the most notable signs of severe hypothermia is the absence of shivering. In mild to moderate hypothermia, shivering is a common reflex that helps generate heat. However, as the condition worsens and the body temperature continues to decline, the body's mechanisms begin to fail—resulting in a cessation of shivering.

Additionally, individuals with severe hypothermia often exhibit impaired motor functions. This can manifest as weakness, confusion, or difficulty walking, often due to the body's attempt to conserve energy and function properly at low temperatures. The inability to walk indicates a significant impact on the nervous system and muscle function caused by the extreme cold.

In contrast, other choices describe symptoms or signs that are typically associated with different stages of hypothermia or other conditions but do not align with the characteristics of severe hypothermia. For instance, rapid breathing and excessive sweating are more common in various heat-related illnesses, whereas extreme shivering is indicative of moderate hypothermia. Understanding these signs is essential for recognizing the severity of hypothermia and providing appropriate care.