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Anatomy > Epithelia > Flashcards

Epithelia Flashcards

1
Q

What are epithelia?

A

Continuous sheets of cells that cover the exterior surfaces of the body, line internal closed cavities and body tubes
Secretory portions of glands

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2
Q

What do epithelial cells stand on?

A

The basement membrane

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3
Q

Do epithelial cells have a blood supply?

A

No, they are avascular

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4
Q

How do epithelial cells receive oxygen and metabolites?

A

Via diffusion

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5
Q

What are the two major types of epithelia?

A

Covering epithelia

Glandular epithelia

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6
Q

What 4 things do covering epithelia do?

A

Selective diffusion
Absorption and secretion
Physical protection
Containment

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7
Q

What are the two types of gland?

A

Exocrine

Endocrine

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8
Q

Describe exocrine glands

A

Can be unicellular or multicellular

Secretions delivered into ducts

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9
Q

Describe endocrine glands

A

No ducts

Released into blood stream

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10
Q

What three things help us classify epithelia?

A

How many layers of cells are there?
What is the cell shape?
Are the specialisations on the apical surface?

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11
Q

What name is given to a layer of single cells?

A

Simple epithelium

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12
Q

What is the name given to two or more layers of cells?

A

Stratified epithelium

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13
Q

What is pseudostratified epithelium?

A

One layer of cells where the nuclei are at different heights givin the appearance of more than one layer

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14
Q

What is a squamous cell?

A

A flat cell

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15
Q

What is a cuboidal cell?

A

A cell that appears square

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16
Q

What is a columnar cell?

A

A cell that appears taller than it is wide

17
Q

What are microvilli?

A

Fine, finger-like projections which contain a central core of microfilaments

18
Q

What are cilia?

A

Long, motile projections of the apical surface

Contain a core of microtubules

19
Q

What is keratin?

A

Layers of the protein keratin are found on the apical surface

20
Q

What are goblet cells?

A

Goblet cells secrete mucus onto the apical surface

Anatomy (16 decks)

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