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BDS1 Microbiology > Epithelial Tissues > Flashcards

Epithelial Tissues Flashcards

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Biology 101 flashcards
1
Q

what are epithelial tissues

A

line all surfaces

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2
Q

what is the main function of epithelial tissue

A

barrier function - continuous boundary between different environments

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3
Q

how are epithelia arranged

A

continuous sheet of tightly bound cells

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4
Q

what does polarised mean

A

all the apex surfaces of the cells point towards the external surface (lumen)

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5
Q

what are tight junctions

A

create an impermeable seal between adjacent cells

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6
Q

what are desmosomes

A

anchor adjacent cells together and can ensure cells can stretch without being pulled apart

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7
Q

name four additional functions of epithelial tissue apart form barrier

A

protection
diffusion
absorption
secretion

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8
Q

what are the three components of classification for epithelial tissues

A

shape
number of cell layers
apical speicalisation

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9
Q

what are the three types of epithelial cells

A

squamous
cuboidal
columnar

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10
Q

what are the two classifications of cell layers of epithelium

A

simple
stratified

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11
Q

what are pseudostratified epithelium

A

look columnar book nuclei are all at different heights - appears as multiple layers but only have one layer

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12
Q

what is transitional epithelia

A

more than two cell layers but the cells in the tissue do not conform to just one shape - good for stretching

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13
Q

what are examples of apical specialisations in epithelial cells

A

microvilli
cilia
keratin

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14
Q

what is the function of simple squamous epithelia

A

passive diffusion

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15
Q

what is the function of simple cuboidal epithelia

A

small ducts involved in absorption or secretion

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16
Q

what is the function of simple columnar epithelia

A

absorptive surfaces and can sometimes find microvilli

17
Q

what is the function of cilia

A

to help substances move down the tissue - eg in the ovaries

18
Q

what are goblet cells

A

modified columnar epithelial cells that synthesise and secrete mucous

19
Q

what is the function of stratified cuboidal and columnar epithelia

A

secretion

20
Q

what is the function of stratified squamous epithelia

A

protection from mechanical abrasion

21
Q

how does shedding of skin cells (stratified squamous) work

A

cells are cuboidal at the bottom, they are flattened as the cells get pushed to the top and they die and shed

22
Q

where is transitional epithelium found

A

bladder

23
Q

what is ulceration

A

break in the continuity of the epithelium

24
Q

what histological features can be seen in dysplastic epithelial cells

A

they degrade the basement membrane so they can spread to underlying connective tissues

25
Q
A

BDS1 Microbiology (4 decks)

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