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30 Cards in this Set
- Front
- Back
What is the surface area of the skin?
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2 meters
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The skin bye itself weighs how much?
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9 pounds
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How much is the skin of your whole body weight?
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7%
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What is the skin called?
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the integument (covering)
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Is the skin tough?
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Yes, the skin is very pliable and very tough.
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What is the skin composed of?
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the epidermis and the dermis
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What is the outter most layer and what is it made of?
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Epidermis ; made up of epithelial cells
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What is the bulk of the skin and what is it composed of?
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Dermis ; fibrous connective tissue
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Which of the two is vascularized?
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dermis
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Which one gets nutrients by diffusion?
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Epidermis
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What is subcutaneous tissue just deep to the skin called?
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hypodermis; is not considered skin but shares qualities
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What is the hypodermis made mostly of?
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adipose tissue (fat); this anchors skin and allows it to slide
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As weight is gained what does the hypodermis do?
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It gets thicker.
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In females, where does the subcutaneous fat first accumulate?
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in the thighs and breasts.
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In males. whers does the subcutaneous fat first develope?
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anterior abdomen (beer belly)
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What is thick keratinized stratified squamous epithelium?
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epedermis
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Epidermis
what are the 4 cell types? |
keratinocytes, melanocytes, merkel cells, Langerhans' cells
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What is the most abundant epidermal cell?
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kerotinocyes
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What is the kerotinocytes major role?
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to produce keratin for protection
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What are the kerotinocytes connected by?
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desmosomes
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When the keratinocytes reach the surface of the skin what happens?
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they die
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When do you get a totally new epidermis?
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every 35 to 45 days
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What is the growth of the epidermis controlled by?
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(EGF) epidermal growth factor
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What epidermal cell synthesizes the pigment melanin?
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melanocytes
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Where are melanocytes found in and what do they look like?
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found in the deepest layers and they are spider shaped. The branches touch all of the kerotinocytes.
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What is the melanocytes pigment made in, and what usually happens to the pigment?
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It is made in glanules called melanosomes; they are sometimes sloughted off
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What are the melanocytes engulfed by?
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the kerotinocytes
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What are the melanocyes used for?
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used as protection for the nucleus from UV radiation
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How many melanocyte cells does every human have?
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All humans have relatively the same # of these cells.
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Skin coloration and race depend on what when it comes to melanocytes?
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It depends on the activity or speed of the breakdown.
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