What is the primary function of dermal papillae?

The primary function of dermal papillae is to increase the surface area for nutrient exchange. These small, nipple-like projections are located at the interface between the dermis and the epidermis. By extending into the epidermis, dermal papillae enhance the contact area between these two layers of skin. This increased surface area allows for more efficient diffusion of oxygen, nutrients, and waste products between the blood supply in the dermis and the cells in the epidermis.

Furthermore, the design of the papillae aids in anchoring the epidermis tightly to the dermis, which is essential for maintaining skin integrity and strength. This unique structure is especially prominent in areas of skin that experience a lot of shear force, such as the fingertips, where the increased surface area also contributes to enhanced grip and tactile sensation.

While other options highlight important functions related to skin health and integrity, they do not directly address the primary role of dermal papillae in the context of enhancing nutrient exchange.