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Skins and tissues 2 (Kahoot Questions - (Thick skin can be found on the…

- - - - increases dermal blood flow, which also increases heat loss
    - - decreases derma blood flow which decreases heat loss
    - - conduction
        
        Less heat loss
        
        heat moves by physical contact
        
        the reason the seat you sit in is warm when you stand up
      - convection
        
        Heat loss to surrounding air
        
        increases as air movement increases that is why turining on a fan cools your body
      - Radiation
        
        most heat loss by this mode
        
        infrared heat rays moe from area of high heat to areas of low heat
      - evaporation
        
        Heat loss varies
        
        if heat increases our sweating increases, so we lose more heat by evaporating the sweat on the surae of our skin
  - - - reddenig due to increases blood flow
      - mild pain
      - common in sunburn
      - Epidermis only
      - heals in a few days - 2 weeks
    - - epidermis and some dermal damage
      - reddening and blistering caused by blood vessel damage
      - moderate pain
      - common to phsical contact with hot objects
      - heals in 2-6 weeks wihtout scars unless infected
    - - dry, leathery tissue with red or blak color
      - severe pain
      - Epidermis entire dermis and potentially subcutaneal damage
      - caused by prolonged heat or chemical contact
      - healing rarely occurs due to lack of surviving skin cells, skin replacement are usually needed
      - Autograft
        
        transplant from yourself
      - Homograft
        
        temporaty transplant from cadaver
- - - - associated with every hair follicle
      - secretion = sebum
      - Fat, cellular material
      - sebum is secreted into hair follicle
      - function
        
        Sebum keeps skin & hair soft, pliable and virtually waterproof
      - disorders
        
        Acne, Seborrhea
  - - - 2-5 million glands
      - structue
        
        coil in deep dermis
        
        duct in dermis
        
        pore at surface
      - Characteristics
        
        respond to elevated temperature / exercise
        
        no odor in secretion
        
        function througout life
        
        not asssociated with hair follicles
      - Location
        
        forehead, neck, back
      - Secretion = 99% water plus salts and wastes
    - - structure
        
        ducts terminate into hair follicles
      - chraracteristics
        
        respond to stress / emotions
        
        odor in secretion
        
        begin to function t puberty & continue though life
        
        associated with hair follicles
      - locations
        
        armpits, groin
      - secretion = sweat above glands
        
        oil and cellular debris
      - Modified apocrine glands
        
        ceruminous glands = ecternal ear secretion = earwax, cerumen
        
        mammary glands = breasts, milk
- - - - Hair root or base in deep dermis, follicle throughtout dermis
      - Hair shaft in epidermis
      - Cuticle out shingle like layer
      - medulla inner layer hard keratin
      - cortex middle layer flexable soft keratin
    - - grows for 2-5 years / new cycle pushes old hair out
      - 0.3mm per day
      - 2.5 million on body / 500,000 hairs on the head
    - - Cells are epithelium
      - cells in root = active mitosis
      - cells in follicle = maturing & accumelating keratin
      - cells in epidermis = dead epithelial cells, full of keratin = exposed hair or hair shaft
    - - Melanin decreases with age
      - genetically determined
      - white hair / grey
      - lack of melanin and air bubbles
    - - Peg of connective tissue
      - nerves and capillaries
    - - a bundle of smooth muscle associated with every hair follicle
      - causes hair to stand on end when frightened or cold
- - - - manipulation
      - protection of digit ends
    - - nail body covers the nail bed, nail root
      - nail production by an epithelial fold
      - lunula, pale crescent near nail root
      - cuticle, fold of stratum corneum