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zoo141 Chapter 5

skin pigment/skin color conditions/hair layers and follicle structures

QuestionAnswer
[PIGMENTS IN SKIN] melanin (brown, yellow-brown, black) absorbs ultraviolet radiation
[PIGMENTS IN SKIN] carotene (orange-yellow) normally accumulates in epidermal cells
[PIGMENTS IN SKIN] hemoglobin red, most apparent in lightly pigmented individuals
[SKIN COLOR CONDITIONS] albinism due to genetic lack of melanin
[SKIN COLOR CONDITIONS] cyanosis due to decreased oxygen in blood
[LAYERS OF HAIR] cuticle outermost layer, contains hard keratin
[LAYERS OF HAIR] cortex intermediate layer, contains hard keratin
[LAYERS OF HAIR] medulla innermost layer, contains soft keratin
[LAYERS OF HAIR] hair matrix germinative cells produce hair
[HAIR FOLLICLE STRUCTURES] internal root sheath surrounds hair root
[HAIR FOLLICLE STRUCTURES] external root sheath consists of epithelial cells, extends from skin surface to hair matrix
[HAIR FOLLICLE STRUCTURES] arrector pili muscles contracts to pull hair erect and force sebum into follicle
[HAIR FOLLICLE STRUCTURES] root hair plexus sensory nerves surrounding base of hair follicle
[HAIR GROWTH CYCLE] active phase hair grows continuously
[HAIR GROWTH CYCLE] resting phase hair loses its attachment to follicle, becomes a club hair
[SKIN GLANDS] sebaceous [oil] glands secrete sebum
[SKIN GLANDS] sweat glands merocrine and apocrine
Created by: btuehara
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