Final answer:
Intrinsic factors that influence the skin's structures include changes in cell division, metabolism, blood circulation, hormonal levels, and muscle strength, which affect the epidermis, dermis, and hypodermis, leading to aging effects such as thinning skin and decreased wound healing.
Step-by-step explanation:
The intrinsic factors that influence the skin's supporting structures are related to the body's internal physiological processes. As we age, there are several changes to these structures: reductions in cell division, metabolic activity, blood circulation, hormonal levels, and muscle strength. Specifically in the skin, aging is reflected in decreased mitosis in the stratum basale, resulting in a thinner epidermis. The dermis shows diminished regenerative abilities, which leads to slower wound healing and less elasticity due to less collagen and elastin. Additionally, the hypodermis loses structure from the reduction and redistribution of fat, contributing to skin thinning and sagging.