PSY 402 Lecture Notes - Lecture 3: Lactose Intolerance, Maximum Force, Central Nervous System
20 Apr 2016
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Physical changes - psy402 chapter 4 - class notes. Dermis: second outermost layer of the skin. Cells lose functioning = skin flexibility and elasticity. Elastin becomes less able to return to original shape. Cross-linking in collagen causes skin to become less flexible. Age spots (lentigo senilus) start to develop over the course of adulthood. Bownish spots, that appear on your face and body. Sun exposure is a major environmental factor contributing to aging. Photoaging: age-related changes caused by radiation through exposure of ultraviolet rays. Changes in the face are a result of: Changes in cartilage causing the nose and ears to appear longer. Graying of the hair caused by loss of pigmentation overtime. Loss of pigmentation is due to decrease in melanin. Variations in the rate at which pigmentation changes occur due to genetics. Greying - # of unpigmented hairs > # of pigmented hairs. Decreased production of melanin: white hair mix. Decreased lean tissue/fat-free mass (ffm)(e. g. muscle mass)
