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|Integumentary System Functions||
Resistance to trauma & Infection
Acts as barrier (water, UV)
Vitamin D synthesis
Sensation, Thermoregulation and Non-Verbal communication
|5 layers of Epidermis||
thin, single layer of cuboidal stem cells resting on basement membrane
several layers of keratinocytes/At thickest layer undergoing mitosis
3-5 layers of keratinocytes. keratinocytes contain dark stained keratinohyalin granules.
thin zone above stratum granulosum. cells don't have nuclei. only seen in thick skin.
up to 30 layers of dead, scaly, keratinized cells. resists abrasion, penetration & H2O loss.
abnormal redness of skin. due to exercise, sunburn. Due to increased blood vessel flow or dermal pooling of red blood cells.
pale color. Due to low blood pressure, anemia, circulatory shock
lack of melanin.
yellowing of skin/whites of eyes. Due to bilirubin in blood.