Cricks Dermal & Skin Color Vocab
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| Name the structures that increase the surface area of the dermal surface. | dermal papillae
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| Name the two functions of the dermal papillae? | Some carry blood supply, some facilitate sensation.
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| Name the 2 tissue types found most commonly in the dermis. | Collagen and elastin (elastic fibers)
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| Name the physical property of dermal tissues that allow it to stretch. | elasticity
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| Name the physcial property of dermal tissues that allow it to return to its original shape after being stretched. | extensibility
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| Over-strecthing of the dermal layer can result in tearing of the layer, resulting in silvery-white streaks being seen in the skin. What are they called? | stretch marks
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| Name the 3 pigments that give skin its color. | Melanin, carotene, hemoglobin.
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| Name the pigment is responsible for the difference in skin color in people? | Melanin
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| What causes some people to have more melanin than others? | Their melanocytes produce more melanin. Everyone has the same NUMBER of these cells (roughly.)
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| Name the two skin issues are caused by patches of melaning accumulating in the dermis. | Freckles and liver spots
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| Describe the effect of UV light on melanin producing cells? | When exposed to UV, cells produce more melanin producing a tan.
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| Describe why a tan is lost over time? | The melanin producing cells die and slough off the skin surface in a few days
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| Name the genetic disorder that prevents the skin from producing melanin | Albinism
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| Name the pigment that gives the stratum corneum its yellow color. | carotene
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| Caucasian people have skin tones with pink to red features. What causes this? | Hemoglobin in the blood.
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| What determines the redness of the skin in white people? | The amount of oxygen in the blood.
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