What is the primary function of the sudoriferous gland?

The primary function of the sudoriferous gland, commonly known as a sweat gland, is heat regulation. These glands play a vital role in thermoregulation by secreting sweat onto the surface of the skin. As sweat evaporates, it removes excess heat from the body, helping to maintain a stable internal temperature during physical activity or in response to elevated environmental temperatures. This process is essential for preventing overheating and ensuring that the body's physiological functions remain optimal, especially during times of exertion or high temperatures.

While the other options touch on different bodily functions, they do not accurately define the primary role of the sudoriferous gland. For instance, the secretion of oil is primarily associated with sebaceous glands, protection against infection is a function more closely related to other components of the immune system and skin structure, and nutrient absorption is primarily the function of the digestive system rather than the skin or its glands.