Integumentary System Flashcards
(129 cards)
sebaceous glands
secrete sebum (oil) that lubricate the skin and discourages bacteria growth
epidermis
outermost layer of skin, several specialized epithelial tissues
epithelial tissues
form protective covering for all the internal and external surfaces of body
squamous epithelial tissue
forms upper layer of epidermis consisting of flat, scaly cells that are continuously shed
basal layer
lowest layer of epidermis where new cells are produced are push upward
keratin
fibrous, water-repellent protein - soft keratin is primary component of epidermis and hard keratin is hair and nails
melanocytes
cells in basal layer that produce and contain dark brown to black pigment melanin
melanin
pigment that determines color of skin, and produces freckles and age spots
dermis
thick layer of living tissue below epidermis containing blood vessels, lymph vessels and nerve fibers. also hair follicles, sebaceous glands and sweat glands
collagen
tough and flexible fibrous protein in skin
mast cells
found in connective tissue of dermis respond to injury, infection or allergy by producing and relaxing substances
Heparin
anticoagulant released by mast cells in response to injury
Histamine
substance release by mast cells in response to allergens, causing allergic reaction
subcutaneous layer
below layers of skin and connects skin to surface muscles
Adipose tissue
fat
lipocytes
fat cells - manufacture and store large quantities of fat
arrestor pili
tiny muscles fibers attached to hair follicle that cause hair to stand erect. Contract in cold and create goosebumps to reduce heat loss thru skin
unguis
fingernail or toenail
lunula
half moon shaped area at nail root that forms new keratin cells
comedo
noninflected lesion formed by buildup of sebum and keratin - whiteheads and blackheads
epidermoid cyst
closed sac just under skin containing yellow fatty material
seborrheic dermatitis
inflammation from seborrhea that courses itchy and scaling or upper layers of skin - dandruff/cradle cap
seborrheic keratosis
benign skin growth that has a waxy or pasted on look
diaphoresis
profuse sweating brought on by heat or exertion, physical or emotional distress