Approximately what percentage of water does eccrine sweat contain?

Eccrine sweat is primarily composed of water, with approximately 99% of its content being water. This high water content is important for the thermoregulatory function of eccrine sweat glands, as it helps in cooling the body through the process of evaporation. The remaining 1% consists of various salts, urea, and other metabolic wastes, which are less significant compared to the predominant water content. This understanding of eccrine sweat composition is crucial in both physiological studies and practical applications, such as in forensic science and the assessment of body temperature regulation. Other options, while closer to the water content of sweat than very low values, do not accurately represent the well-established fact that eccrine sweat is composed of around 99% water.