Final answer:
Atrophic dermatosis is the thinning of the skin due to aging and the associated changes to the integumentary system, including decreased cell division, blood circulation, and reduced production of collagen and elastin.
Step-by-step explanation:
Atrophic dermatosis refers to the thinning of the skin, which is a result of aging and changes occur in the integumentary system. With age, all body systems, including the skin, undergo changes such as decreased cell division, less metabolic activity, and lower blood circulation. These changes lead to reduced mitosis in the stratum basale, causing a thinner epidermis. Additionally, the dermis, which maintains the skin's elasticity and resilience, shows a diminished ability to regenerate, leading to delayed wound healing and other signs like wrinkling.
The changes in the integumentary system also mean lower sebum and sweat production, resulting in thinner hair and nails, and possibly contributing to heat intolerance in the elderly. Reductions in the activity of melanocytes and dendritic cells cause a paler skin tone and weakened immune response. Furthermore, a decrease in collagen and elastin in the dermis underlies the development of wrinkles and sagging skin. These age-related changes altogether compromise the skin's structure and ability to maintain adequate moisture.