What is the primary role of collagen in the skin?

Collagen plays a crucial role in providing structure and strength to the skin. It is the most abundant protein in the skin's dermal layer, serving as a primary component of connective tissue. This structural integrity supports the skin's elasticity and firmness, making it vital for maintaining the skin's overall appearance and health. As skin ages, collagen production decreases, which can lead to signs of aging such as wrinkles and sagging.

The other options do not accurately represent the primary function of collagen. Temperature regulation is primarily the role of sweat glands and blood vessels. Oil production is handled by sebaceous glands, which produce sebum to moisturize the skin. Nutrient absorption is largely facilitated through the skin's surface and other biological processes, not through collagen specifically. Thus, the choice highlighting collagen's role in providing structure and strength directly addresses its essential contribution to skin integrity.