PSYC 3490 Chapter Notes - Chapter 4: Pattern Hair Loss, Vellus Hair, Bone Mineral

• School: York University
• Department: Psychology
• Course: PSYC 3490
• Professor: Laurie Mc Nelles

Document Summary

First signs of aging appear in the 30s. Epidermis outermost layer that consists of a thin covering that protects the underlying tissue. Subcutaneous bottommost layer giving the skin its opacity and smoothing the curves of the arms, legs, and face: starting in middle adulthood, this layer starts to thin, providing less support for the layers above it. Fair-skinned people tend to display more rapid effects of aging than those with darker skin. Photo-aging age changes caused by radiation from exposure to the sun: the sun"s uv rays accelerate the process of cross-linking, causing mutations that alter protein synthesis by the cells, and increasing the producing of free radicals. Hair loss results from the destruction of the germination centres that produce the hair in the follicles. People get shorter as they get older, more pronounced for women: this is because the loss of bone material in the vertebrae; the spine collapses and shortens in length.