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Block 1 CTB > Epithelium Histology > Flashcards

Epithelium Histology Flashcards

1
Q

What is the function of transitional epithelia?

A

Allows ducts and organs to stretch and expand

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2
Q

What is the function of simple squamous epithelia?

A

Provides minimal barrier for diffusion

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3
Q

What is the function of stratified squamous epithelia?

A

Protects against abrasions

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4
Q

What is the function of simple cuboidal epithelia?

A

Found in ducts and glands; secretes and absorbs

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5
Q

What is the function of stratified cuboidal epithelia?

A

Protective

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6
Q

What is the function of simple columnar epithelia?

A

May have cilia; absorbs and secretes

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7
Q

What is the function of stratified columnar epithelia?

A

Secretes and protects

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8
Q

What is the function of pseudostratified columnar epithelia?

A

Has cilia; secretes mucus

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9
Q

Describe the location and shape of nuclei in squamous epithelium.

A

Nuclei are centrally located and disk-shaped

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10
Q

If an epithelium contains layers of different cell shapes, for example both squamous cells on the apical surface and cuboidal on the basal surface, what would it be classified as and why?

A

In this case it would be classified as stratified squamous epithelium, because stratified epithelium is named according to the shape of the cells on the apical surface

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11
Q

In terms of basal epithelial cells and apical epithelial cells, which ones are metabolically active and which are dead?

A

Basal epithelial cells are metabolically active and apical epithelial cells are dead

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12
Q

Describe the location and shape of nuclei in cuboidal epithelium.

A

Nuclei are centrally located and spherical

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13
Q

Microvilli and stereocilia both contain which protein?

A

Actin

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14
Q

What is the function of villi and microvilli?

A

Increase the surface area, usually of the mucosa, available to carry out absorption

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15
Q

What is the function of keratin proteins?

A

Provide strength to the epithelium so that it can resist abrasion

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16
Q

What is the function of stereocilia?

A

Detect changes in hearing and balance and communicate these to the brain

17
Q

What shape are the sweat glands in the skin?

A

Simple coiled tubular

18
Q

What is the function of tight junctions?

A

Form a complete band around the apical membranes of epithelial cells to prevent paracellular transport of water

19
Q

What is the function of gap junction?

A

Connexons allow movement of ions and solutes between cells

20
Q

What is the function of desmosomes?

A

Form spot connections between cells

21
Q

What is the function of adherens junctions?

A

Contain cadherins. Linked to actin filaments that form part of the cell cytoskeleton

22
Q

Describe the attachment points of desmosomes.

A

Cadherins are attached to attachment plaques, which are attached to keratin

23
Q

Describe the difference between cilia and microvilli in terms of motility and function.

A

Cilia are motile and facilitate the transport of substances

Microvilli are non-motile and increase the surface area of the epithelium

Block 1 CTB (13 decks)

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