What do capillaries in the dermis help regulate?

The capillaries in the dermis play a crucial role in regulating heat dissipation and nutrient supply to the skin. These small blood vessels are abundant in the dermal layer, allowing for the exchange of heat and nutrients between the blood and surrounding tissues.

When the body temperature rises, the capillaries dilate (a process known as vasodilation), allowing more blood to flow to the skin's surface. This increased blood flow helps dissipate heat through the skin, facilitating cooling, which is essential for maintaining optimal body temperature. Conversely, in cooler conditions, these capillaries can constrict to minimize heat loss.

Additionally, capillaries are responsible for delivering oxygen and nutrients essential for skin cell metabolism and health. They supply the epidermis with necessary substances, supporting cellular processes and promoting overall skin vitality.

In summary, the function of capillaries in the dermis is integral to both thermoregulation and providing the skin with nutrients, making the chosen answer particularly significant in understanding the integumentary system's adaptation mechanisms.