What body system includes skin and accessory organs such as sweat glands, sensory receptors, hair and nails?

The integumentary system is the body system that includes the skin and its accessory organs, which encompass sweat glands, sensory receptors, hair, and nails. This system serves several critical functions, including protection of internal structures, regulation of body temperature, and sensory perception. The skin acts as a barrier against pathogens and physical injury, while accessory structures like sweat glands play a key role in thermoregulation through the secretion of sweat. Additionally, sensory receptors in the skin allow the body to perceive touch, pain, and temperature, contributing to the overall sensory experience.

In contrast, the skeletal system primarily provides structure and support to the body, the circulatory system is responsible for transporting blood and nutrients, and the lymphatic system aids in immune response and fluid balance. Understanding the distinct roles of each body system highlights why the integumentary system, with its focus on skin and related structures, is the correct choice in this context.