the fibrous protein that makes skin waterproof and keeps it strong, also found in hair and nails
epidermal cell that acts as a macrophage to activate our immune system to destroy foreign substances
deepest epidermal layer made of a single row of cells that undergo rapid cell division
stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, stratum basale
List the 5 layers of the epidermis in order from the superficial to deepest layer.
Which layer of the epidermis consists of a single row of cells where rapid cell division occurs?
Which layer of the epidermis is made up of a weblike system of intermediate filaments with flattened keratinocytes that appear "spiny"
Which layer of the epidermis consists of three to five cell layers with keratinocytes that accumulate granules that form keratin and lipids that provide waterproofing
What are the peglike projections on the superior surface of the dermis that indent the overlying epidermis?
pigment that ranges in color from yellow to reddish-brown to black that is produced when the skin is exposed to sunlight
yellow to orange pigment that is most obvious in the palms of the hands and soles of the feet
A condition that occurs when hemoglobin is poorly oxygenated causing the skin to appear blue
eccrine (merocrine) sweat gland
produces true sweat; abundant on the palms of hand, soles of the feet, and forehead
apocrine sweat glands
produce true sweat plus fatty substances and proteins; found in the axillary (armpit) and anogenital areas of the body
modified apocrine glands found in the lining of the external ear canal; produce sticky, bitter substance called cerumen (earwax)
Hair on skin senses insects before they sting or bite; Hair on scalp protects from physical trauma, heat loss, sunburn; eyelashes shield eyes; nose hairs filter particles in the air
What is the function of hair?
is the part of, the part of the hair contained within the follicle, below the surface of the skin
coarse, long hair found on the head, eyebrows, axillary and genital areas: growth stimulated by male sex hormones
scalelike modification of the epidermis that forms a clear protective covering on the dorsal surface of a finger or toe
Regulates body temperature; Produces Vitamin D; Protection from chemical and physical injury: Blood reservoir; Excretion of nitrogenous wastes
What are the functions of the skin?
tissue damage inflicted by intense heat, electricity, radiation, or certain chemicals, which denature proteins and cause cell death
second degree burn
destroys the epidermis and part of the dermis; characterized by pain, blisters, swelling, and discoloration.
third degree burn
destroys epidermis and dermis, appear leathery and dark, no pain, insensitivity to pain due to nerve damage; fluid loss & increased risk of infection due to damage of protective barrier