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EPHE 141 > Day 2 epithelial tissue > Flashcards

Day 2 epithelial tissue Flashcards

1
Q

many simillar cells working together form what?

A

A tissue

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2
Q

What are the functions of epithelial tissue? (4)

A

physical protection

controls permeability

provides sensation

secretions

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3
Q

typically epithelial tissue is found near what type of tissue?

A

connective tissue

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4
Q

What are three characteristics of epithelial tissue?

A

cellularity- composed almost entirely of cells

Polarity- exposed [apical] and basal surface

Attachments- Basal layer to basement membrane adjacent cells

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5
Q

this organelle is found in high concentration in muscle cells and lower levels in bone cells

A

mitochondria

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6
Q

what is an example of an epithelial cell that shows polarity? think location and function

A

epithelium that lines most of the respiratory tract. The small bristly area are micro villi found on the exposed surface of mucus producing cells

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7
Q

epithelial tissue is typically found in close proximity to connective tissue why is this?

A

because epithelial tissue is avascular

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8
Q

what are the three shapes of epithelia?

A

squamous
cubodial
columnar

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9
Q

what is the epithelial classification based on number of layers?

A

simple
stratified
pseudostratified
transitional epithelium

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10
Q

Simple epithelia can be what?

A

squamous
cuboidal
columnar

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11
Q

stratified epithelia can be what?

A

squamous

Maybe cuboidal sometimes

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12
Q

where do you find simple squamous epithelium?

A

pleural pericarial and peritoneal body cavities; andothelia lining heart and blood vessels; alveoli of lungs

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13
Q

what is the function of simple squamous epithelium?

A

reducess friction

controls vessel permiability

performs absorption and secretion

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14
Q

where is stratified squamous epithelium found?

A

surface of skin

lining of oral cavity

throat

esophagus

rectum

anus

vagina

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15
Q

what is the function of stratified squamous epithelium?

A

provides physical protection against abrasions, pathogens and chemical attacks

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16
Q

where is simple cuboidal epithelium found?

A

glands ducts and kidney tubules

17
Q

what are the functions of simple cuboidal epithelium?

A

limited protection

secretion

absorption

18
Q

what is the location of stratified cuboidal epithelium?

A

lining of some ducts (rare)

19
Q

what is the function of stratified cuboidal epithelium?

A

protection secretion and absorption

20
Q

What is the location of simple columnar epithelium?

A

linings of stomach and intestines

21
Q

what is the function of simple columnar epithelium?

A

protection secretion and absorption

22
Q

what is the location of stratified columnar epithelium?

A

mammary glands and salivary glands

23
Q

what is the function of stratified columnar epithelium?

A

protection

24
Q

what is the location of psudostratified ciliated columnar epithelium?

A 
lining of nasal cavity 
nasal cavity
trachea
bronchi
portions of male reproductive tract
25
Q

what is the function of psudostratified ciliated columnar epithelium?

A

protection and secretion

26
Q

What is unusual about psudostratified columnar epithelium?

A

looks like stratified but it is one layer thick

27
Q

What is the location of transitional epithelium?

A

urinary bladder; renal pelvis; ureters

28
Q

what is the function of transitional epithelium?

A

permits expansion and recoil after streching

29
Q

what are tight junctions also called?

A

occluding juctions

30
Q

what is the zonula adherens also called?

A

adhesion belt

31
Q

what are the button desmosomes also called?

A

macula adherens or desmosomes

32
Q

what are communication junctions also called?

A

gap junction

33
Q

what do tight junction do?

A

prevents movement of substances to underlying tissues or water-soluble materials in intercellular space

ex epithelium of digestive wall

34
Q

zona adherens what is an example? what are the characterisitcs?

A

cams and proteoglycans form junctions with cytoskeleton filaments

often at terminal web

ex. superficial layer of skin

35
Q

where are Hemidesmosomes found?

A

they have a strong attachment to basal lamina

found where there is a lot of sheering

ex. esophagus

36
Q

gap junctions are used for what?

A

communicating junctions between cells; chemical and electrical coupling

epithilial cells with cilia, neurons or cardiac muscle

ex. produce synchronous activation of heart muscles

EPHE 141 (42 decks)

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