What is the main function of the integumentary system?

• A. To facilitate gas exchange and sensation
• B. To protect the body and regulate temperature
• C. To produce hormones and regulate metabolism
• D. To transport nutrients and waste

Answer: (B)

The integumentary system's primary function is to protect the body and regulate temperature. This system includes the skin, hair, nails, and associated glands. The skin serves as a barrier against environmental hazards such as pathogens, chemicals, and physical injuries. It also plays a critical role in homeostasis by regulating body temperature through mechanisms such as sweating and adjusting blood flow to the skin.

When the body temperature rises, sweat glands produce sweat, which evaporates to cool the body down. Conversely, when it's cold, blood vessels constrict to retain heat. This regulatory function is essential for maintaining optimal conditions for the body's internal processes.

Additionally, the integumentary system helps in sensation through sensory receptors that detect touch, pain, pressure, and temperature, contributing to the body's ability to respond to the environment. While the other options present functions like gas exchange, hormonal production, or nutrient transport, these are not primary roles of the integumentary system, thereby reinforcing the correct answer's focus on protection and temperature regulation.