EPITHELIUM Flashcards

1
Q

this tissue consists of sheets of cells that cover the external surfaces of the body, line the internal cavities and the organs, form various organs and glands, and line their ducts.

A

Epithelial Tissue

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2
Q

Epithelium is _____ by the blood vessels and is therefore ________

A

not supplied, avascular

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3
Q

two functional types of epithelium:

A

lining epithelium and glandular epithelium

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4
Q

Absorption occurs via?

A

endocytosis or pinocytosis

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5
Q

Secretion of various molecules (e.g., hormones, mucus, proteins) occurs by?

A

exocytosis

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6
Q

Protection from abrasion and injury is provided by

A

epidermis, the epithelial layer of the skin.

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7
Q

a specialized, feltlike sheet of extracellular material referred to as the ?

A

basement membrane

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8
Q

major transmembrane link to proteins of Zonula Occludens

A

occludins, claudins, ZO proteins

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9
Q

major transmembrane link to proteins of Zonula Adherens

A

E-cadherin, catenin complexes

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10
Q

major transmembrane link to proteins of Macula Adherens

A

Cadherin family proteins (desmogleins, desmocollin)

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11
Q

major transmembrane link to proteins of Hemidesmosome

A

Integrin

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12
Q

major transmembrane link to proteins of Nexus

A

Connexin

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13
Q

cytoskeletal components of Zonula Occludens

A

Actin filaments

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14
Q

cytoskeletal components of Zonula Adherens

A

Actin filaments

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15
Q

cytoskeletal components of Macula Adherens

A

intermediate filaments (keratin)

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16
Q

cytoskeletal components of Hemidesmosome

A

Intermediate filaments

17
Q

cytoskeletal components of Nexus

A

none

18
Q

This junction seals adjacent sells to one another, controlling passage of molecules between them; separates basolateral and apical domains

A

Tight Junction (Zonula Occludens)

19
Q

This junction provides points linking the cytoskeletons of adjacent cells; strengthens and stabilizes nearby tight junctions

A

Adherent Junction (Zonula adherens)

20
Q

This junction provides points of strong intermediate filament coupling between adjacent cells, strengthening the tissue.

A

Macula Adherens (desmosome)

21
Q

The Hemidesmosome anchors what?

A

cytoskeleton to the basal lamina

22
Q

The Gap Junction or Nexus allows direct transfer of what molecules?

A

small molecules and ions from one cell to another

23
Q

_______ are motile structures found on certain cells in the uterine tubes, uterus, efferent ducts in the testes, and conducting tubes of the respiratory system.

A

Cilia

24
Q

They are small, nonmotile projections that cover the surfaces of all absorptive cells in the small intestine and the proximal convoluted tubules in the kidney.

A

Microvilli

25
Q

What are Stereocilia?

A

They are long, nonmotile, branched microvilli that line the cell surfaces in the epididymis and vas deferens.

26
Q

Where can Simple Squamous Epithelium be found? (location)

A

Location: Endothelium (lining of blood vessels), Mesothelium (lining of peritoneum and pleura)

27
Q

Location of the Simple Cuboidal Epithelium

A

Lining of distal tubule in kidney and ducts in some glands, surface of ovary

28
Q

What epithelium is described?
Location: Lining of intestine, stomach, and excretory ducts in some glands

A

Simple Columnar Epithelium

29
Q

What epithelium is being described?
Location: Lining of trachea, primary bronchi, nasal cavity, and excretory ducts in parotid gland

A

Pseudostratified Columnar Epithelium

30
Q

What epithelium is being described?
Location: Lining of esophagus, vagina, mouth, and true vocal cords (nonkeratinized); Epidermis of skin (keratinized)

A

Stratified Squamous Epithelium

31
Q

What epithelium is being described?
Location: Lining of ducts in sweat glands; Lining of large excretory ducts in some glands and cavernous urethra

A

Stratified Cuboidal and Columnar Epithelium

32
Q

What epithelium is being described?
Location: Lining of minor and major calyces, pelvis, ureters, and the bladder of the urinary system

A

Transitional Epithelium