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histology let > Epithelium > Flashcards

Epithelium Flashcards

1
Q

lining of surfaces of the body cavities; glandular secretion

A

epithelial tissue

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2
Q

where does the epithelium rest?

A

basal lamina

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3
Q

a thin continuous supporting layer that separates the epithelial tissue from the underlying connective tissue

A

basal lamina

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4
Q

what are the basal lamina composed of

A

type 4 collagen, laminin, and proteoglycans

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5
Q

single layer of flattened cells usually joined by intercellular junctions and resting on basement membranes

A

simple squamous epithelium

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6
Q

provides protection, forms conduits for gland ducts, and may be specialized for active secretion and absorption

A

simple cuboidal epithelium

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7
Q

mainly found in sites engaged in protection of wet surfaces, nutrient absorption, and secretion

A

simple columnar epithelium

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8
Q

poorly suited for absorption and secretion by virtue of their thickness; some are moderately permeable to water and other small molecules; two or more layers of cells

A

stratified epithelium

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9
Q

can be seen in epidermis

A

stratified squamous keratinized

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10
Q

widely distributed in the mouth, esophagus, larynx, vagina, and anal canal

A

stratified squamous non-keratinized

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11
Q

widely distributed in the mouth, esophagus, larynx, vagina, and anal canal

A

stratified squamous non-keratinized

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12
Q

examples includes sweat glands and developing ovarian follicles

A

stratified cuboidal

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13
Q

example includes conjunctiva

A

stratified columnar

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14
Q

found only in the urethelium with special features to make it waterproof and expansile

A

transitional epithelium

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15
Q

hairlike organelles that are easily observed in light microscopy

A

cilia

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16
Q

most important type of cilia

A

motile cilia

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17
Q

what happens when there is a defective cilia?

A

kartagener syndrome

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18
Q

extremely long microvili which is usually found in singly or small numbers

A

stereo cilia

19
Q

it increases the surface area for absorption by 30x

A

microvilli

20
Q

disorder of the small intestine in which one of the first pathologic changes is loss of the microvilli brush border of the absorptive cells

A

celiac disease

21
Q

celiac disease is triggered by what?

A

wheat, barley, and rye

22
Q

enumerate the histologic triad of celiac disease

A

appearance of intraepithelial lymphocytosis; inflammation, villous atrophy

23
Q

modified columnar epithelial cells that synthesize and secrete mucus

A

goblet cells

24
Q

ductless and release products called hormones directly into the bloodstream

A

endocrine glands

25
Q

connect to the surface by ducts which take the secretions to the surface or lumen

A

exocrine glands

26
Q

no destruction after secretion

A

merocrine

27
Q

it involves the cell filling with secretory products; total destruction

A

holocrine

28
Q

part of the cell is excreted out together with the secretory products of the cell; partial destruction

A

apocrine

29
Q

main protein components of tight junction

A

claudins, occludins, tricellulin

30
Q

site of tight junction

A

luminal end of lateral cell membrane

31
Q

main function of tight junction

A

control of paracellular diffusion; prevents exchange of intrinsic proteins

32
Q

main protein component of adhering belt

A

classic catherine, catenins

33
Q

site of adhering belt

A

lateral plasma membrane; immediately deep to tight junction

34
Q

main function of adhering belt

A

link cytoskeletons of adjacent cells to form strong cohesive epithelium

35
Q

main protein component of desmosome

A

cadherins

36
Q

site of desmosomes

A

lateral plasma membrane

37
Q

main function of desmosome

A

link cytoskeletons of adjacent cells to form strong cohesive epithelium

38
Q

main components of hemidesmosome

A

integrins, laminins of basement membrane

39
Q

site of hemidesmosome

A

basal plasma membrane

40
Q

main function of hemidesmosome

A

link cells to underlying basement membrane

41
Q

main components of gap junctions

A

connexins

42
Q

site of gap junctions

A

lateral plasma membrane

43
Q

main function of gap junctions

A

passage of ions and small molecules between cells; intercellular signaling

histology let (9 decks)

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