Which of the following is NOT a component of sweat?

Sweat is primarily composed of water, which makes up about 99% of its content. In addition to water, sweat contains several solutes, including urea and antibodies. Urea is a waste product that is excreted by the body, and antibodies play a role in the immune defense of the skin.

Fatty acids, however, are not found in significant quantities in sweat. They are generally associated with the sebaceous glands, which produce sebum, not sweat. The main function of sweat is thermoregulation, achieved through the evaporation of water from the skin’s surface, rather than lipid-based components. Therefore, the presence of fatty acids would not be consistent with the composition of sweat.