Epithelial Tissue Flashcards
Epi
Sit on top of something
Where is the epithelial tissue located?
It sits on top of other tissues and forms outer layer.
Epithelial tissue can also be found where? (Other then the outer layer)
The lining of hollow organs
True or false?
Always free top and apex
True
Cellularity?
Tightly packed cells
True or false
Avascular with nerve endings
True
Innervation characteristic
supplied with nerves
Regenerative characteristic
Replaced frequently
The cleaners, sweepers, and absorbers
Cilia and microvilli
Squamos
Flat(squashed)
Cuboidal
Cube-shaped
Columnar
Column-like(oval shaped nuclei sit at bottom and is easy to ID)
Transitional
Stretchy and variably shaped
Simple(layer type)
Single layer all the same type
Stratified(layer type)
Lots of layers; named by type of cell on outer layer
Simple squamos
Structure-single layer of thin flat cells
Function-diffusion(very thin/permeable, very slick)
Location-inside of blood vessels, inside of heart, lines walls of capillaries, feeds tissue, and alveoli(air sacs of lungs)
Simple cuboidal
Structure-single layer of subs-shaped cells w/ central nuclei
Function-secretion(glands) and absorption(places w/ microvilli)
Location-kidney tubes, ducts of some glands(salivary, thyroid, pancreas, liver), absorption, gland excretion
Endocrine(gland type)
Makes product inside and secretes into matrix
- capillaries come inside gland and pick up the product
- product=ALWAYS HORMONE
Exocrine(gland type)
Gland secretes its products outside itself using a duct
-Ex. Saliva, mucous, sweat, enzymes, oil/wax, reproductive fluids, milk
Histology
Study of tissue
Cells are anchored with…
Desmosomes and tight junctions
Simple columnar
Structure-long cells, nuclei at bottom, microvilli & cilia
Function- absorber, cilia helps move things
Location-uterus, Fallopian tubes, stomach, intestines
Pseudo stratified columnar
Structure-looks like one layer but not, nuclei not all on bottom, have cilia and goblet cells
Function-sweeps debris out of lungs goblet cells produce mucin, histamine released by WBCs
Location-upper respiratory tract(bronchi, trachea, bronchioles)
Stratified squamous
Structure-flattened multiple laters of cells
Function-body’s wear and tear tissue, takes friction and exposure
Structure-outer layer of skin, lines mouth, throat, vagina, and anal canal
Melanocytes
Give people their pigment, and people can varying amounts
Keratin
Tough protective and waterproof protein
Epithelial sits on what type of tissue?
Connective tissue
3 types of carcinoma?
Basal cell:least severe and most common
Squamous cell
Malignant melanoma:deadly and least common
What does the ABCD method stand for in mole observation?
A-asymmetry
B-boarder
C-color
D-diameter
1st degree burn
Top of epidermis burned
Signs and symptoms: painful, red, no blisters
Heals in 3-7 days
Treatment: cool and compress, aloe Vera
2nd degree burn
Epidermis and part of dermis burned
S&S: painful, red, blister, pealing and dead skin days later
Heals in 7-10 days depending on depth
Treatment: cool compress, aloe Vera, do not break blisters
3rd degree burn
Epidermis and dermis burned entirely
S&S: no pain, nerve endings burned, oozing and skin slippage, whitish or grayish color
Heals in months to a year depending on location and % burned
Treatment: rule of nines
Stratified cuboidal
Structure- 2 or 3 layers of cuboidal cells lining opening of larger glands
Function- greater protection and secretor
Location- mammary glands, sweat glands(larger glands)
Stratified columnar
Structure- several layers of columnar cells
Location- male reproductive, pharynx, distal esophagus, cardiac sphincter, can be replaced by stratified squamous, constantly being damaged by acid reflux
Transitional
Designed to distend and return to normal size
Lining of urinary bladder
Transitions from cuboidal to squamous as bladder fills
Cutaneous membrane
Functions like tarp over boat
Example: skin
Mucous membrane
Lines openings to outside(digestive tract, respiratory, urinary, reproductive)
Contains specialized cells that produce mucus
Serous membrane
2 layered membrane with potential space between
- parietal: lines walls of cavities
- visceral: wraps around organs and both produce serous fluid which reduces friction between tissues and organs
