Which of the following functions does the integumentary system perform?

The integumentary system plays a crucial role in regulating body temperature, which is fundamental for maintaining homeostasis. This system includes the skin, hair, and nails. The skin acts as a barrier and contains sweat glands that help cool the body through the process of sweating. When the body temperature rises, these glands secrete sweat, which evaporates and cools the skin. Additionally, blood vessels in the skin can dilate or constrict to either increase or decrease blood flow, contributing to the regulation of body temperature.

This function is vital for ensuring the body's temperature remains within a safe range, allowing metabolic processes to occur effectively. Other functions of the integumentary system include protection against pathogens and environmental hazards, sensation, and vitamin D synthesis, but the key performance in temperature regulation is particularly significant.