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integumentary system and diseases A+P CH.8 lecture 3 (hair (hair shaft…
integumentary system and diseases A+P CH.8 lecture 3
burns
can be caused by heat, chemical and radiation
1st degree
damaged epidermis
2nd degree
entire epidermis and some dermis
3rd degree
all three layers of skin
4th degree
penetrates bone and cause bone damage, destroy muscle and tendons
rules of nine used to estimate damaged area of burn
autografting
using patients own skin
heterografting
required if patient suffered large area of burn and has little healthy skin to graft
nails
specialized epithelial cells originating from nail root to form nails
nail bed
where cells grow out and become keratinized forming hard part of nail
cuticle
fold of tissue that covers nail room
nail body
portion that we see
sterile matrix
layer of cells that helps nail body to stick to stick to nail bed
luluna
white half moon shaped area is result of thicker layer of cells at base
hair
helps regulate body temperature
helps detect big or cobwebs
eyelashes
helps protect eyes from objects
hair in nose
helps filter our debri
kerotin
fibrous protein that composes visible hair
hair shaft
hair you see
composed of dead cells
sebaceous gland
secretes sebum that coats hair follicle and goes to skin surface to prevent dry hair
more melanin= darker hair, less melanin=lighter hair
flat shaft=curly hair , round shaft=straight hair
Alopecia
any type of hair loss
could be inherited or disease
could be chemotherapy, hormonal imbalance, scale infections, emotional or physical stress, medication
lice
tiny insect parasites that live on scalp/skin
pediculosis
lice infestation
spread by contact of infected person or object
types
head lice
body lice
public
scabies
tiny mite that burrow in skin to lay eggs
spread by direct contact with infected person
lodge in wrists, underarms, groin, under breast
temperature regulation
done by changes in blood vessels
vasodilation
body's attempt to get as much hot blood exposed to cooler surrounding environment, so heat radiates away from body
vasoconstriction
forces blood away from the skin and back to core of body where the heat is