integumentary system
DESCRIPTION
Integumentary System. Protecting you from the outside world. Parts of the system. Skin Layers- dermis, epidermis Hair follicles Nails Sweat Glands Sebaceous Glands *Some consider other membranes as well (ex- mucosal). We will only look at skin. Skin. 2 layers Epidermis Dermis - PowerPoint PPT PresentationTRANSCRIPT
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Integumentary SystemProtecting you from the outside world
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Parts of the systemSkin
◦Layers- dermis, epidermisHair folliclesNailsSweat GlandsSebaceous Glands
*Some consider other membranes as well (ex- mucosal). We will only look at skin
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Skin2 layers
◦Epidermis◦Dermis
Epidermis◦Dead, keratinized skin, made of 5 layers of
dead skin ◦Constantly shed◦Holds melanocytes, make melanin, skin
pigmentDermis
◦Under epidermis◦Made of blood vessels, connective tissue
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Within the skinHair folliclesSweat GlandsSebaceous Glands
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Hair FolliclesCells within dermis divide by
mitosis◦As cells push up, keratinization
occurs (like epidermis)◦Type of keratin (genetically
determined) results in hair’s shape (straight, curly, etc.)
Goosebumps◦Small muscle pulls on hair, causing
to stand on end◦Evolutionary reaction to trap heat
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Sweat GlandsSmall tubes beginning in dermal
layerTube exits on epidermis
◦Excretion contains Salt Urea Uric acid Ammonia Sugar
◦As water evaporates, removes heat from body
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Sebaceous GlandsAlong sides of hair folliclesCreate oily substance that rubs
onto hair and skinIncrease production during
puberty, acne!
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NailsAlso keratinizedAs keratin and air mix, white
substance is left on nail nearest skin
Nail bed grows nails1mm per week
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DiseasesEczemaPoison Ivy/Poison
Oak/PoisonwoodAlbinismAthlete’s FootTreeman
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EczemaAny inflammation of the
epidermisResult of infection, allergen, or
irritant
Causes redness, swelling, itching
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Poison _________Plants that secrete chemicals
that irritate the skin of MOST people
Includes poison ivy, poison oak, poisonwood, and cashews!
Once oils washed off, rash cannot be spread◦You cannot spread by itching the
rash unless the oil is still on you
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Poisonwood rashCashew
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AlbinismRecessive genetic mutation
results in body’s inability to produce melanin, a pigment
Causes very pale skin, hair, eye coloration
Same mutation exists in many mammals
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Albinism
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Athlete’s FootFungal infection, primarily of feet,
but can occur anywhere on bodySpread by contact
◦This is why you wear shower shoes in college!!!
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Athlete’s Foot
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TreemanRare double-genetic disorder
resulting in body having difficulty regulating zinc levels
Causes large wart-like growths all over body
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Treeman