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42 Cards in this Set
- Front
- Back
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integumentary system
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skin & acessory structures
(skin, nails, glands) |
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hypodermis
(subcutaneous tissue or superficial facia) |
attach the skin to underlying bones & muscles & supply it with blood vessels and berves.
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2 major tissue layers of the skin:
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dermis
epidermis |
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dermis
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connected to the epidermis
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epidermis
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rest on the dermis
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2 layers of the dermis:
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reticular
papillary |
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reticular layer of the dermis-
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deep layer
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papillary layer of the dermis-
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superifcial layer
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5 regions (strata) of the epidermis:big stupid guts love courtney
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stratum basale
spinosum granulosum lucidum corneum |
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stratum basale
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deepest portion
single layer cubotial or columnar cells |
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statrum spinosum
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8-10 layers
many sides cells |
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stratum granulosum
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2-5 layers
flat diamond shape |
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stratum lucidum
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several layers
dead cells indistinct boundaries |
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stratum corneum
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most superficial layer
25 or more layers dead squamous cells |
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thick skin
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has all 5 epithelial strata & the stratum corneum has many layers of cells.
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where is thick skin found?
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palms of hand
soles of feet |
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Thin skin is found:
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over the rest of the body. the stratum granulosum frequently consist of 1 or 2 layers of cells.
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skin color is determined by:
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pigment
blood circulating through the skin thickness of stratum corneum |
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melanina is group of pigments responsible for
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responsible for skin, hair, and eye color.
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melanin provide protection againts_______
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ultraviolet rays
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hair is one charcteristic of _____
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all mammals
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2 parts of hair:
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shaft
root |
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hair shaft
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protrude above the surface of the skin
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hair root
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located below the surface of the skin
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concentric layer of the hair root:
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medulla
cortex curticle |
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medulla
cortex curticle |
central axis of the hair
form the bulk of the hair a single layer of cells that form the hair surface |
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most of the hair root is composed of____
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keratinized epithelial cells
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the hair follicle contain the hair and consist of______ & ____
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dermal root sheath
epithelial root sheath |
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2 stages of the hair cycle:
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growth stage
resting stage |
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How do hair grow longer?
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cells are added to the root
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scalp hairs grow for ? years
rest for ? years loos ? stands a day |
3
1-2 100 |
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arrector pili
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are smooth muscle cells that extend from the dermal root shealth of the hair follicle to the derms.
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contraction of arrector pili occurs in response to?
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cold or frightening situation
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major glansds of the skin
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sebaceous
sweat |
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sebaceous gland secrete_____
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sebum which is a oily white substance rich in lipids.
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whar do sebum prevent?
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drying and provides protection against bacteria.
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2 types of sweat gland:
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Merocrine (Eccrine)
Apocrine |
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Merocrine (Eccrine) sweat gland
they produce sweat that _____ & ___ the body. |
palms of hand
soles of feet evaporate cool |
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Apocrine sweat gland
they poduce substances that are quickly metabolized by ____& cause ____ ______ |
axillae
genitalia bacteria body odor |
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parts of the nail
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nail root - covered by skin
nail body- visible portion of nail |
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Nail is composed of ____ ____ that is hard keratin.
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stratum corneum
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Function of integumentary system:
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protection
temp. regulation vit. D production sensation excretion |
