Final answer:
Skin with moisture deficiency and fine lines is showing aging signs because of the thinning epidermis, decreased production of collagen and elastin in the dermis, and structural loss in the hypodermis.
Step-by-step explanation:
Skin that lacks moisture with small, fine lines and wrinkles on the surface exhibits signs of aging in the integumentary system. As a person ages, there are reductions in cell division, metabolic activity, blood circulation, hormonal levels, and muscle strength. The epidermis becomes thinner, leading to a decrease in the skin's ability to maintain moisture, and the dermis, which is responsible for the skin's elasticity and resilience, shows a reduced ability to regenerate. This leads to slower healing and the appearance of lines and wrinkles. The hypodermis also loses structure due to the reduction and redistribution of fat, contributing further to the thinning and sagging of the skin. With reduced production of collagen and elastin, and the weakened muscles underneath, the skin displays the typical signs of aging like dryness, fine lines, and wrinkles.