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Histology Lecture > Histology Lecture (Epithelial Cells) > Flashcards

Histology Lecture (Epithelial Cells) Flashcards

1
Q

Group of similar cells specialized in a common direction to perform a common function

A

Tissues

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2
Q

3 primitive germ
layers tissue is derived from

A
  1. ectoderm
  2. mesoderm
  3. endoderm
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3
Q

4 Primary Tissues

A
  1. Epithelial tissues
  2. Connective tissues
  3. Muscular tissues
  4. Nervous tissues
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4
Q

____________ is made up of ____________, closely arranged and strongly attached to each other that they have scanty intercellular substances.

A
  • Epithelial Tissue
  • Polyhedral cells compact
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5
Q

Epithelial Tissues are attached to ____________

A

extracellular matrix (ECM)

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5
Q

Is avascular or no blood vessels found among the cells.

A

Epithelial Tissue

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6
Q

This means there is no blood vessels found among the cells.

A

Avascular

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6
Q

If the Epithelial tissue is avascular, how and where does it get its nourishment?

A

Nourishment is conveyed through osmosis and
diffusion from blood vessels located at the tunica
propia

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7
Q

Covers the body surfaces and those found as sheets lining the organ cavities.

A

Epithelial Tissue

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8
Q

Epithelial Tissues are usually wet except where?

A

Epidermis of the skin

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9
Q

Some Epithelial tissues are arranged in the form of masses. Give 2 examples.

A
  1. Adrenal gland
  2. Parathyroid gland
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10
Q

Epithelial Tissue Cells are replaced through?

A

Mitosis

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11
Q

3 main functions of Epithelial Tissue.

A
  1. Absorption
  2. Secretion
  3. Covering
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12
Q

Epithelial Tissue Function: Absorption

A

Distribution: Small Intestine

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13
Q

Epithelial Tissue Function: Secretion

A

Distribution: Glands

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14
Q

Epithelial Tissue Function: Excretion

A

Distribution: Kidney Tubules

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15
Q

Epithelial Tissue Function: Protection

A

Distribution: Skin/Epidermis

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16
Q

Epithelial Tissue Function: Sensory Reception

A

Distribution: Neuroepithelium

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17
Q

Epithelial Tissue Function: Lubrication

A

Distribution: Sebaceous Glands

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18
Q

Epithelial Tissue Function: Reproduction

A

Distribution: Lining of the Ovary

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19
Q

Where all epithelial tissue cells are attached.

A

Basement Membrane/Basal Lamina

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20
Q

Provides anchorage for the cells.

A

Basement Membrane/Basal Lamina

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21
Q

Barrier limiting or regulating exchanges of macromolecules b/w CT and other tissues.

A

Basement Membrane/Basal Lamina

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22
Q

Components contribute to image of basement membrane

A
  1. Basal Lamina
  2. Reticular Fibers
  3. Ground Substances
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23
Q

2 layers of Basement Membrane

A
  1. Basal
  2. Reticular
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24
Q

Type of basement membrane that contains Type IV Collagen and Lamina.

A

Basal

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25
Q

Type of basement membrane that contains type III Collagen and Type VII Collagen.

A

Reticular

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26
Q

It provides support to the epithelium and vascularized CT bed.

A

Tunica Propia/Lamina Propia

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27
Q

T or F: All epithelia has tunica propia.

A

True

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28
Q

Structures Associated with Epithelial Tissues

A
  1. Basement Membrane/Basal Lamina
  2. Tunica Propia/Lamina Propia
29
Q

2 Specialization of Epithelial Tissues

A
  1. Tendency to maintain excessive contact with
    one another.
  2. For cell attachment and communication.
30
Q

In __________, it refers to the structural
and functional differences b/w 2 ends.

A
  • Columnar Epithelium
  • Polarity
31
Q

Imaginary line passing through the
centrosome and center of the nucleus.

A

Cell Axis

32
Q

Perpendicular to basal lamina.

A

Cell Axis

33
Q

Made of feltwork of fine filaments
beneath the surface.

A

Terminal Web

34
Q

Provide mechanical support for
ciliated or striated borders.

A

Terminal Web

35
Q

In the “Tendency to maintain excessive contact with one another,” give 3 specializations.

A
  1. Polarity
  2. Cell Axis
  3. Terminal Web
36
Q

Cell attachment and communication can be observed only by?

A

Electron Microscopy

37
Q

Give 4 Juxta-luminal Junctional Complex

A
  1. Zonula Occludens/Tight Junctions
  2. Zonula Adherens/Intermediate Junctions
  3. Desmosomes/Macula Adherens
  4. Gap Junctions/Nexus
38
Q

Most apical of the junctions.

A

Zonula Occludens/Tight Junctions

39
Q

Junction encircle the cell.

A

Zonula Occludens/Tight Junctions

40
Q

Adjoining cell converge and fused to close intercellular space

A

Zonula Occludens/Tight Junctions

41
Q

Its outer leaflets of adjacent unit membrane are fused, giving rise to a local pentalaminar appearance.

A

Zonula Occludens/Tight Junctions

42
Q

It has a mechanical role in maintenance of structural integrity of cells

A

Zonula Occludens/Tight Junctions

43
Q

Serve as tight seal preventing flow of materials b/w epithelial cells (parallel pathway).

A

Zonula Occludens/Tight Junctions

44
Q

Responsible for structure called terminal bar

A

Zonula Occludens/Tight Junctions

45
Q

Extends around the entire perimeter of the cell. found at the apex of the cell.

A

Zonula Occludens/Tight Junctions

46
Q

2 proteins in Zonula Occludens/TIght Junctions

A
  1. Claudin
  2. Occludin
47
Q

Regions where adjacent cells are firmly held together.

A

Zonula Adherens/Intermediate Junctions

48
Q

Where can Zonula Adherens/Intermediate Junctions can be found (4)?

A

Found b/w:
1. epithelial cells
2. fibroblast
3. smooth muscle cells
4. intercalated disc of cardiac muscles

49
Q

Also responsible for terminal bar.

A

Zonula Adherens/Intermediate Junctions

50
Q

Function of Zonula Adherens. Couples what?

A

Couples Actin

51
Q

Protein of Zonula Adherens/Intermediate Junctions

A
  1. Cadherins
52
Q

Adhering Junctions

A
  • Zonula Adherens/Intermediate Junctions
  • Desmosomes/Macula Adherens
  • Hemidesmosomes
53
Q

Impermeable Junctions

A
  • Zonula Occludens/Tight Junctions
54
Q

Communicating Junctions

A
  • Gap Junctions/Nexus
55
Q

Disk-like structure at the surface of 1 cell that is
match with identical structure at surface of
adjacent cell

A

Desmosomes/Macula Adherens

56
Q

____________ is only present in stratified squamous epithelium attach the ends of short processes (erroneously interpreted as “___________”)

A
  • Desmosomes/Macula Adherens
  • Intracellular Bridges
57
Q

Only function is as special adhesion of cells.

A

Desmosomes/Macula Adherens

58
Q

2 protein of Desmosomes/Macula Adherens.

A
  1. Desmoglein
  2. Desmocollin
59
Q

Function of Desmosomes/Macula Adherens. Couples what?

A

Couples Intermediate Filaments

60
Q

Contact b/w certain epithelial cell and basal lamina.

A

Hemidesmosomes

61
Q

Protein of Hemidesmosomes.

A

Integrin

62
Q

Diseases when desmosomes are abnormal.

A
  1. Blistering Disease
  2. Bullous Disease
63
Q

Where can Desmosomes can be found?

A

Stratified Epithelia of esophagus, mouth, and vagina.

64
Q

Bipartite structures of opposing cell membranes.

A

Desmosomes/Macula Adherens

65
Q

______________ can be mistaken for zonula occludens but _______________.

A
  • Gap Junctions/Nexus
  • opposing membrane are not fused
66
Q

____________ can occur almost anywhere along ____________ of most epithelial cells.

A
  • Gap Junctions/Nexus
  • Lateral membranes
67
Q

Gap Junctions are only absent in?

A
  1. skeletal muscle
  2. blood cells
68
Q

Well developed in tissues where cells are
electrically coupled

A

Gap Junctions/Nexus

69
Q

Gap junctions are well developed in tissues where cells are electrically coupled:

Give 2 examples.

A
  1. cardiac cells
  2. smooth muscle cells
69
Q

Protein of Gap Junctions/Macula Adherens.

A

Connexin

70
Q

It aids in the synchronization of cells.

example: the pumping action of cardiac cells.

A

Gap Junctions/Nexus

Histology Lecture (4 decks)

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