BIOL355 Lecture Notes - Lecture 26: Human Hair Color, Brown Hair, Blood Vessel
21 Apr 2017
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Document Summary
Development of air pockets in the shafts loss of softness and luster. Hair color determined by the amount and type of pigment produced by the basal layer. Varying amounts of melanin produce the blond brunette black spectrum. Pigment with an iron base causes red hair. Time and rate of graying determined largely by heredity. Loss of melanocytes less pigment (produces gray to white) Less protective skin barrier, permanents, color cosmetics, excess heat and thinner scalp leads to aged, damaged follicle with thin grey hair. Sweat and sebaceous glands atrophy: less sweat and oil production results in drier, scalier skin. Regulation of body temperature: less perspiration, heat exhaustion. Adipose redistribution from the limbs, neck, and face to the hips and trunk. Prominent blood vessels become more noticeable (thinning of skin) Regular exercise can offset or slow the characteristics of aging skin. Slows down the loss of skin pigments.
