What is perspiration primarily composed of?

Perspiration, commonly referred to as sweat, is primarily composed of water and salts. The main component, water, plays a key role in regulating body temperature through the process of evaporation, which cools the skin. The salts in perspiration, predominantly sodium chloride, help maintain the body’s electrolyte balance and are essential for various bodily functions, including nerve conduction and muscle contraction.

The other components mentioned in the alternatives are less relevant when discussing the primary composition of perspiration. Oils and fats, for example, are not constituents of sweat; instead, they are secreted by sebaceous glands to provide moisture and protection to the skin. Proteins and carbohydrates are present in the body but do not play a significant role in perspiration. Finally, while minerals and vitamins are vital for overall health, they are not the primary components of perspiration. Thus, B is the correct choice as it accurately describes the main constituents of sweat.