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Integumentary system

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zunair's version from 2018-06-13 13:32

Section 1

Question Answer
How does the skin act as a physical/mechanical barrierprotect against bacteria, UV Light, mechanical injury
How does the skin act as a chemical barrierlow pH secretions and defensins for bacterial activity
What are cutaneous sensationstemperature, touch and pain
How does the skin act as a body temp regulatorBlood flow and sweat gland cool body
how does the skin function for immunityLangerhan cells in epidermis (type of WBC)
sudiferous glands are also calledsweat
what does the skin excretesodium chloride, urea, water, minerals, magnesium, lactic acid and alcohol
What does the skin synthesizeVitamin D
memorize

Section 2

Question Answer
What accesory organsNails, hair, sweat glands, oil glands
epidermisuppermost layer
dermismiddle region
hypodermisdeepest region
What does the hypodermis domostly adipose tissue- shock absorber, insulator
memorize

Section 3

Question Answer
Keratinocytesin epidermis, produce fibrous protein keratin
melanocytesin epidermis produce pigment melanin that accumulate in keratinocytes and they protect nucleus from uv light
Langerhan cellsmacrophages in epidermis
Tactile (merkel) cellsin epidermis for touch receptors
What occurs with the epidermis layers from top to innermost layerTop layer has a lot of dead cells and the deeper you go the more active cells occur.
Dermis compositionstrong flexible connective tissue
dermis 2 layerspapillary and reticular
memorize

Section 4

Question Answer
sudofirous glandalso called sweat gland, exocrine
types of sudofirous glandeccrine/merocrine and apocrine glands
sebaceous gland also called oil gland, produce oil secretion (sebum)
Sebum functionkeep hair soft and act as an antibacterial
eccrine/merocrine functionthermoregulation, excretion of water/minerals, antibacterial. widely distributed on body surfaces
apocrine sweat glandon axillary and anogenital areas, can be odiferous if bacteria acts on it
Hair functionprotection, heat retention, sensory reception, disperse chemical signals (pheromones)
hair follicle structureextends from epidermis into dermis
Hair rootpenetrates into dermis - only living part
hairdead, hard keratinized cells
memorize

Section 5

Question Answer
Nail functionprotection
nail bodypink part of the nail
free edge of nail white part of nail on top of body of nail
lunulahalf crescent moon under body of nail
memorize

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