What does the integumentary system consist of?

The integumentary system is primarily comprised of the skin and its layers, which include the epidermis, dermis, and subcutaneous tissue. This system serves as the body's outer protective barrier, playing critical roles in protection, regulation of temperature, sensation, and the synthesis of vitamin D.

While muscles and bones are essential components of the musculoskeletal system, they do not fall under the integumentary system. Similarly, while hair and nails contribute to the overall health and aesthetics of the integumentary system, they are components of the skin and do not constitute the entire system. The organs and glands, although important for bodily function, are primarily associated with other systems, such as the endocrine system or digestive tract, rather than specifically the integumentary system. Thus, the choice identifying the skin and its layers accurately reflects the true composition of the integumentary system.