Chapter 6 Flashcards
(28 cards)
Dermatology
The study and treatment of the integumentary system
The integumentary guards against:
impact
chemicals
abrasion
water loss and water gain
The glands in houses secrete what?
salt, water and organic waste
Temperature regulation does this within the integumentary system:
change vessel diameter in dermis- vasoconstriction to conserve heat. Vas odialate to lose heat
Produces melonin to
protect from UV radiation
produced keratin to
protect from abrasion and is water resistant
produce vitamin D3
steroid important for calcium metabolosm
immune function
contains cells that can initiate an immune response
sensation contains receptors for
touch
pressure
pain
temperature
hypodermis
bottom layer, contains adipose connective tissue
The hypodermic also
stabilizes position of skin relative to underlying tissue while still allowing independent movement and serves as energy resivoir and provides insulation
Dermis is
the middle layer composed of two fiber types
collagen fiber is
strong and resistant
striae
are stretch marks, form if collagen fiber is stretched to far and become torn
elastic fiber
permits stretching and recoiling
After years elastic fiber?
decreases with age, hormone changes and UV radiation which causes wrinkles and sagging skin
layer in the dermis
blend so there is no clear distinction between them
reticular layer is
a deep layer of dense irregular connective tissue, named for network of collagen fiber
papillary layer
has nipple like projections called dermal papillae that interlock with epidermis
epidermis is made up of
stratified squamous epithelial tissue
keratinocytes
make up majority of epidermis, cells are filled with the protien keratin
stratum basale
single layer at the bottom
basal cells
stems cells which divide to replace lost or shed superficial keritinocytes, make up majority of stratum basal
merkel cells
sense of touch, release chemicals when compressed that stimulate nerve endings
