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List 5 Functions of the skin
- 1) Protection - against bacteria, underlying tissue from injury & loss of body fluid
- 2) Perception - Sense of touch, heat & cold, pain & pressure
- 3) Temperature Control - body produces sweat to cool, heat regulator
- 4) Absorption - moisture & medication
- 5) Excretion- skin gets rid of water,salt, & waste
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How does the skin regulate body temperature ?
- surface vessels dilate, allows heat to escape to cool off body,
- Vessels constrict to reduce loss of heat ( retain heat)
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How does the body cool off?
- Sweat Glands produce sweat,
- Sweat evaporates from skin surface & then you cool off
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What are the three layers of skin?
- a) subcutaneous - bottom layer, contains blood vessel, nerves & fat globules
- b) dermis- middle layer, "true skin" contains blood vessels, nerves, hair follicles, sweat & oil glands
- c) epidermis- top layer, ridges, appear on the soles of your feet
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Which layer of skin contains blood vessels, nerves, hair follicles, sweat & oil glands?
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Dermis- contains blood vessels, nerves, hair follicles, sweat & oil glands?
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What causes wrinkles?
- the fatty underline tissue in the skin breaks down,
- causing the skin to lose its elasticity,
- causes excess of outer layer to develop wrinkles & folds
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Why does exposure to sun darken skin?
- the melanin rises to the surface,
- causing it to tan
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Why does the skin become red when you blush?
- the blood vessels dilate,
- blood vessels enlarge,
- causes redness in the skin
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Macule
colored spot, neither elevated nor depressed
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Papule
solid, elevated circular red mass
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Pustule
small circumscribed lesion, with exudate & lymph
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Vesicle
blisterlike, elevated mass, containing serous fluid
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Wheal
round lesion, white center, itches
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loss of hair usually on scalp
alopecia
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raised wheal surrounded by reddened areas, itches
Urticaria
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red macule, becomes vesicle,then pustle yellow crust & outer rim
Impetigo
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red papules, silvery scales
psoriasis
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flat lesion, dry scaly, moist,crusty, outer ring
Ringworm
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Verrucae is medical term for
warts
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temporary red itchy spot caused by an allergic reaction or insect bite is
a wheal
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