Final answer:
The integumentary system comprises the d) skin, hair, nails, and sweat glands, providing protection, sensory feedback, and maintaining homeostasis.
Step-by-step explanation:
The integumentary system comprises the skin, hair, nails, and sweat glands. This system, being the body's largest organ system, provides a protective covering for the body, senses the environment, and helps maintain homeostasis. The skin, which is a vital part of the integumentary system, makes up about 16 per cent of body weight and covers an area of 1.5 to 2 m² in the adult human body. In addition to protection, the integumentary system also involves various sensory receptors that help in perceiving the environment. Nails and hair, fellow components of this system, similarly contribute to the body's homeostasis, acting as external extensions of the skin. These structures not only protect the body but also play a role in our metabolic processes due to their inner vascularized layers.