What is the primary function of sweat glands?

• A. To produce oil for skin hydration
• B. To regulate body temperature through perspiration
• C. To enhance skin elasticity and firmness
• D. To provide a protective barrier against infections

Answer: (B)

Sweat glands primarily function to regulate body temperature through the process of perspiration. When the body's internal temperature rises, such as during exercise or in response to hot environments, the sweat glands secrete sweat onto the surface of the skin. As the sweat evaporates, it cools the skin and helps to lower the body’s overall temperature. This mechanism is crucial for maintaining homeostasis and preventing overheating.

While sweating can also play a minor role in eliminating certain waste products and providing some moisture to the skin, its primary and most critical function in humans is thermoregulation. Other functions mentioned in the options, such as producing oil or providing a protective barrier, are served by different types of glands or through other processes in the integumentary system, rather than by sweat glands specifically.