Histology of Epithelial Cells Flashcards

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1
Q

What are 3 features of the epithelium?

A
  1. Forms dense cellular sheets attached to each other via desmosomes (structure by which 2 cells are attached)
  2. Has no blood vessels (nutrients diffuse from connective tissue
  3. Sits on a basal lamina complex (Separates the epithelium from underlying connective tissue)
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2
Q

What are the 4 classifications of epithelium tissues?

A

Cell shape, arrangement, specialised and specialised cells

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3
Q

How can you identify simple squamous epithelium?

A

Lining surfaces involve in passive transport of gasses or fluids

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4
Q

How do you identify simple cuboidal epithelium?

A

It forms a cuboid shape and is single layered.

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5
Q

How long is a microvilli?

A

0.5-1 micrometre long

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6
Q

What type of epithelial cell is a goblet cell?

A

A columnar cell

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7
Q

What is a way of identifying a pseudostratisfied cell?

A

All the cells are attached to the basement membrane

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8
Q

What is the length of a cilia projection?

A

7-10 micrometres

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9
Q

How many microtubules does cilia have?

A

20

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10
Q

Give some identifications of stratified epithelium?

A
  • Physical protection in oral cavity, pharynx, oesophagus, uternine cervix and vagina
  • Sites subject to mechanical abrasion but kept moist by glandular secretions
  • Cells remain nucleated
  • Physical protection and prevention desiccation
  • Top layer composed of dead cells without nuclei
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11
Q

What are two reasons for keratinisation?

A
1 = protection 
2 = prevention of desiccation
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12
Q

How does keratin prevent desiccation?

A

Cells become extremely flattened, keratins become cross-linked by disuphide bridges, cells die, lose nuclei and become dehydrates and keratin filaments packed together.

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13
Q

What are 3 good aspects of transitional epithelium?

A

It accommodates a large degree of stretch, protection from toxic content and it is waterproof.

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