Ch. 5 Inaugmentary System
Terms
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- What is the surface area of the skin?
- 2 meters
- The skin bye itself weighs how much?
- 9 pounds
- How much is the skin of your whole body weight?
- 7%
- What is the skin called?
- the integument (covering)
- Is the skin tough?
- Yes, the skin is very pliable and very tough.
- What is the skin composed of?
- the epidermis and the dermis
- What is the outter most layer and what is it made of?
- Epidermis ; made up of epithelial cells
- What is the bulk of the skin and what is it composed of?
- Dermis ; fibrous connective tissue
- Which of the two is vascularized?
- dermis
- Which one gets nutrients by diffusion?
- Epidermis
- What is subcutaneous tissue just deep to the skin called?
- hypodermis; is not considered skin but shares qualities
- What is the hypodermis made mostly of?
- adipose tissue (fat); this anchors skin and allows it to slide
- As weight is gained what does the hypodermis do?
- It gets thicker.
- In females, where does the subcutaneous fat first accumulate?
- in the thighs and breasts.
- In males. whers does the subcutaneous fat first develope?
- anterior abdomen (beer belly)
- What is thick keratinized stratified squamous epithelium?
- epedermis
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Epidermis
what are the 4 cell types? - keratinocytes, melanocytes, merkel cells, Langerhans' cells
- What is the most abundant epidermal cell?
- kerotinocyes
- What is the kerotinocytes major role?
- to produce keratin for protection
- What are the kerotinocytes connected by?
- desmosomes
- When the keratinocytes reach the surface of the skin what happens?
- they die
- When do you get a totally new epidermis?
- every 35 to 45 days
- What is the growth of the epidermis controlled by?
- (EGF) epidermal growth factor
- What epidermal cell synthesizes the pigment melanin?
- melanocytes
- Where are melanocytes found in and what do they look like?
- found in the deepest layers and they are spider shaped. The branches touch all of the kerotinocytes.
- What is the melanocytes pigment made in, and what usually happens to the pigment?
- It is made in glanules called melanosomes; they are sometimes sloughted off
- What are the melanocytes engulfed by?
- the kerotinocytes
- What are the melanocyes used for?
- used as protection for the nucleus from UV radiation
- How many melanocyte cells does every human have?
- All humans have relatively the same # of these cells.
- Skin coloration and race depend on what when it comes to melanocytes?
- It depends on the activity or speed of the breakdown.