Evolve HESI Practice Exam 2025 - Free HESI Practice Questions and Study Guide

The identification of common signs of dehydration is critical for effective patient assessment and management. Thirst is often one of the earliest indicators that the body requires more fluids, as it signals a deficiency. Dry mucous membranes occur because dehydration reduces the moisture content in body tissues, making them less hydrated and more prone to dryness. Additionally, a high heart rate is a physiological response to dehydration; as fluid volume decreases, the heart compensates by increasing its rate to maintain adequate circulation and blood pressure.

In contrast, the other options include signs that either do not correlate with dehydration or reflect conditions contrary to what one would expect in a dehydrated patient. For instance, increased appetite is not typically a sign of dehydration; rather, individuals may have reduced desire to eat due to the body's focus on maintaining hydration. Stable heart rate and normal urine output generally indicate adequate hydration, not dehydration. Lastly, swollen extremities do not signify dehydration; instead, they may suggest fluid retention or other underlying issues. In essence, option C accurately captures the physiological responses seen in a dehydrated patient.