What is the function of the integumentary system?

The integumentary system plays a crucial role in protecting the body and regulating temperature. This system, which includes the skin, hair, nails, and associated glands, serves as the body's first line of defense against environmental hazards such as pathogens, chemicals, and physical abrasions. The skin acts as a barrier that prevents harmful substances from entering the body while also shielding internal organs from damage.

In addition to its protective functions, the integumentary system is essential for temperature regulation. The skin helps maintain a stable internal environment through processes such as sweating and the dilation or constriction of blood vessels. When the body becomes too hot, sweat glands produce sweat that evaporates, cooling the skin's surface. Conversely, when the body is cold, blood vessels constrict to retain heat.

This dual function of protection and temperature regulation is vital for maintaining overall health and homeostasis. The other choices, while important for other body systems, do not accurately reflect the primary functions of the integumentary system.