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What is the most significant factor in skin color?
Melanin, produced by melanocytes. accumulates in stratum basale and spinosum
People of different skin colors have the same number of melanocytes however dark-skinned people...
Produce greater quantities of melanin
melanin granules in keratinocytes are more spread out than tightly clumped
melanin breaks down more slowly
People of different skin colors have the same number of melanocytes however for light-skinned people...
Melanin is clumped near keratinocyte nucleus, so it imparts less color to cells
Melanin breaks down more rapidly; little of it is seen beyond stratum basale, if even there
Exposure to UV rays of sunlight stimulates...
- ...melanin synthesis, thus darkening
Hemoglobin, what is it and where is it found?
Red pigment found in red blood cells
Adds the reddish to pinkish hue in skin
Skin is redder in places such as the lips where blood capillaries are closer to the surface
Carotene - what is it and what does it come from?
Yellow pigment acquired from egg yolks and yellow/orange vegetables
If diet is high in these foods it concentrates in the stratum corneum and fat (hypodermis). Heel is thick with corneum therefore shows this color
Colors for diagnosing people: What is Cyanosis?
Blueness of the skin from lack of oxygen in the circulating blood
Drowning, choking, lung disease (emphysema), cold
Colors for diagnosing people: What is Erythmena?
Abnormal redness due to dilated blood vessels in skin
Exercise, sunburn, anger
Colors for diagnosing people: What is Pallor?
Pale color from so little blood flow through the skin that the white color of collagen in the dermis is visible
Colors for diagnosing people: What is Albinism?
Genetic lack of melanin that results in white hair, pale skin, and pink eyes
Colors for diagnosing people: What is Jaundice?
yellowing of skin due to excess of bilirubin in blood
bilirubin is converted hemoglobin which is supposed to be dumped in bile by the liver. So if the liver isn't working then it can back up.
Colors for diagnosing people: What is Hematoma?
Bruise. mass of clotted blood showing through skin