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anatomy

skinn shiii

QuestionAnswer
What are the accessory structures of the skin? hair, skin glands, and nails
what type of cells is hair? dead keratonyte cells, stratified squamous
Where on the body are their no hair? palms, lips, soles of feet
What is the scientific name for hair? pili
In what parts are their excessive hair? scalp, arm pits, eyebrows
What causes thickness and distribution of hair among body? hormones
What is the visible portion if the hair which pertrudes out of the skin? shaft
What is deep to the shaft and penetrates into dermis? root
What are the layers of the hair? medula, cortex, cuticle, epithelial root sheath
What is composed of interior and exterior root sheath? epithelial root sheath
What covers the hair follicle? derma root sheath
What is the bulgy part of the hair follicle? bulb
what type of cells does the bulb consist of? germanal cells
What do the cells undergo? cell division
Where do the germanal cells reside? matrix region
What type of glands are attached to each follicle? sabaceous glands
What type of muscle is the arrector pili muscle? smooth muscle
How are goosebumps formed? when the arrector pili muscle contracts
How long is the hair growth stage? 2-6 years
What is the resting stage? hair growth stops
What is the partial or complete hair loss? alopecia
What causes alopecia? hormones, age, skin disease, kemotherapy
What makes up hair color? amount and type of melanin
What amount of melanin does white hair have? no melanin
What amount of melanin does grey hair have? a lack of melanin
What type of hair is fine and nonpigmented? lanugo hair
During what period do you have lanugo hair? 9-12 weeks after fertilization
What does lanugo hair cover? fetus body
When does it shed? before birth
What type of hair replaces lanugo hair? vellus hair
What is the thicker courser hair? terminal hair
What masculizing sex hormone causes it? androgen
Where is androgen secreted? testes, ovaries, adrenal glands
What type of hair are males composed of? 95% terminal, 5% vellus
What type of hair are females composed of? 35% terminal, 65% vellus
What is hersutsium? excessive hair growth
What causes male-patter baldness? androgens that may inhibit hair growth
What are the diffierent glands? sabaceous, sudoriferous, ceruminous-cerumen
What do sabaceous glands excrete? sebum
what is sebum? oily substance that lubricate hair, prevents from dryness, and is rich in lipids
Where are sabaceous glands located? dermis
What skin problem is the inflamation of sabaceous glands? acne
What are the two different types of sweat glands? eccrine and apocrine
what causes sweat from eccrine? elevated body temp
what causes sweat from apocrine? emotional stress, sexual excitement
What is ceruminous? modified sweat gland
what is cerumen? waxy substance
Where is cerumen excreted? ear canal
What are nails made up of? hard, dead, keratonized, epidermal cells
What jobs do nails have? protection, grasp small objects, scratching, protction against trauma
What is the lanula made of? densly packed with cells
What is the cuticle composed of? narrow band of epidermal cells
What secures the nail to the finger? hyponychium
What factors contribute to nail growth? season, time, and weather
How does body react to excessive heat? dilation of dermal blood vessels and sweating
How does body respond to excessive cooling? constricting dermal blood vessels, inactivating sweat glands, and shivering
What active cells produce heat? heart and skeletal cells
What controls the skins role in temperature hypothalamus
blood vessels dilate and become more permeable, causing tissues to become red and swollen inflammation
What are superficial cuts filled with? reproducing epithelial cells
How are deeper cuts filled? closed off by clots, covered by scabs, and eventually filled in by fibroblasts, making connective tissue
How are epidermal wonds healed? Repaired by enlargement and migration of basal cells, contact inhibition (cellular response), and division of migrating and stationary basal cells
What are the four phases of deep wound healing? inflammatory phase, migratory phase, a proliferative phase , and maturation phase
Created by: pinkiigirlii
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