What is the primary function of the integumentary system?

• A. Support and protect internal organs
• B. Regulate body temperature
• C. Facilitate movement
• D. All of the above

Answer: (B)

The primary function of the integumentary system is to regulate body temperature. This system includes the skin, hair, nails, and associated glands, all of which work together to maintain homeostasis. The skin plays a crucial role in thermoregulation through mechanisms such as sweating and the dilation or constriction of blood vessels, allowing the body to either release or conserve heat as needed.

While the integumentary system does provide some support and protection to internal organs, its most critical and distinctive role is in temperature control. It also does not primarily facilitate movement, which is more the function of the skeletal and muscular systems. Therefore, while all these systems contribute to overall body function, the integumentary system specifically excels in maintaining a stable internal temperature, making this its primary function.