What is the primary role of sweat glands in the integumentary system?

The primary role of sweat glands in the integumentary system is to excrete waste products and help regulate body temperature through the evaporation of sweat. Sweat is composed primarily of water, electrolytes, and small amounts of metabolic waste products such as urea and ammonia. When the body temperature rises due to exercise, environmental heat, or other factors, the hypothalamus in the brain signals the sweat glands to produce sweat, which is then released onto the skin's surface.

As the sweat evaporates, it carries heat away from the body, cooling it down effectively. This process is crucial for maintaining homeostasis, preventing overheating, and ensuring that the body's internal temperature remains within a safe range during physical activity or exposure to high temperatures.

The other functions mentioned in the options are not associated with sweat glands—hormones are typically released by endocrine glands, oils for skin hydration are produced by sebaceous glands, and warmth regulation occurs through mechanisms like blood flow changes and shivering, but not directly by sweat glands.