Identify the layers of the skin and one function for each.

• A. Epidermis—outer protective barrier; Dermis—provides warmth via hair follicles and nerves; Hypodermis—stores fat and anchors skin.
• B. Epidermis—acts as a barrier against pathogens; Dermis—gives skin its color; Hypodermis—forms keratin.
• C. Epidermis—produces collagen; Dermis—waterproofs the surface; Hypodermis—houses sweat glands.
• D. Epidermis—outer protective barrier; Dermis—strength and elasticity; Hypodermis—stores fat and anchors skin.

Answer: (D)

The skin has three layers, each with a distinct role that fits together to protect and support the body. The outermost layer, the epidermis, acts as the protective barrier against pathogens and helps prevent water loss. It’s composed of keratinized cells that form a tough surface shield.

Beneath it, the dermis provides strength and elasticity to the skin. This layer contains collagen and elastin fibers, along with blood vessels, nerves, hair follicles, and glands, giving the skin structural support and the ability to sense and adapt to the environment.

The deepest layer, the hypodermis (subcutaneous tissue), is mainly fat that stores energy, cushions the body, and helps insulate. It also anchors the skin to underlying tissues.

So the three-layer description—epidermis as the outer protective barrier, dermis as the supporting, elastic layer, and hypodermis as the fat-storing, anchoring layer—best matches how the skin is organized and functions. The other options mix up which layer performs certain roles (for example, color comes from blood supply and pigment in the epidermis, not the dermis; keratin is produced by epidermal cells; glands are located in the dermis), making them less accurate.