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Flashcards in Cytology, Histology Deck (34)
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1
Q

– routine laboratory microscope used for studying tissue sections

A

Light (bright field) microscope

2
Q

– used to study cytology or internal structures of cells; study of electron micrographs

A

Transmission electron microscope (TEM)

3
Q

–used to study the surface features of cells and tissues; obtain a 3-dimensional picture of the tissue

A

Scanning electron microscope (SEM)

4
Q

– permits one to determine whether biological materials have different refractive indices along different optical axes

A

Polarizing microscope

5
Q

– used to study living tissue; works on principal of different refractive indices of cellular and sub-cellular components

A

Phase microscope

6
Q

– a modification of the phase microscope used for the study of living tissue

A

Interference microscope

7
Q

– uses UV light as the light source; used to examine the presence of fluorescent material in tissue sections

A

Fluorescence microscope

8
Q

– uses a laser energy beam; used to optically section a cell and with the appropriate computer equipment can reconstruct a 3-D image of the cell

A

Confocal scanning microscope

9
Q

a. Purpose: to preserve tissue morphology and chemical composition.
Accomplished by rendering tissue insoluble by precipitating proteins and carbohydrates (stabilizes the structure)
b. Commonly used fixatives: 10% buffered formalin, glutaraldehyde, alcohol, osmic acid

A

Fixation

10
Q

a. Purpose: to remove water from tissues so that tissue is miscible with clearing agent
b. Alcohols commonly used as dehydrating agents

A

Dehydration

11
Q

a. Purpose: to replace alcohol with an agent miscible with paraffin
b. Toluene, xylene, benzene

A

Clearing

12
Q

a. Purpose to replace clearing agent with embedding material

b. Paraffin, methacrylate, celloidin, gelatin

A

Infiltration and embedding

13
Q

a. Purpose: to produce thin sections through which light will pass. Paraffin sections cut from 5-7 μm thick
b. Done on an instrument known as a microtome

A

Sectioning

14
Q

a. Purpose: to impart color to a tissue

b. Hematoxylin and eosin (H & E)

A

Staining

15
Q

Artifact due to lysosomal digestion of the cells.

A

Post-mortem degeneration –

16
Q

Artifact due frequently to reagents used in preparing paraffin sections, resulting in empty to clear spaces which during life were occupied by tissue components.

A

Shrinkage –

17
Q

Artifact that occurs when formalin is not properly buffered.

A

Precipitates –

18
Q

Artifact due to defect in paraffin section.

A

Wrinkles and folds –

19
Q

Artifact due to defect in knife, resulting in the tearing or scraping of the tissue when the section is cut.

A

Nick in the microtome knife –

20
Q

Cause of artifacts frequently due to pinching of the tissue when removing tissue from the body.

A

Mishandling of the tissue –

21
Q

the atomic groups upon which color of a stain depends (-N=N-)

A

Chromophore –

22
Q

Stain that has chromophore associated with the basic radicle (cation; +):

A

basic stain

23
Q

structures in the cell or tissue that love basic stains; e.g. nucleus – large number of PO4(3-) radicles (acid radicles)

DNA – chromosomes; heterochromatin
RNA – nucleolus and cytoplasmic ribosomes
A

Basophilic substances –

24
Q

Blue to purple basic stain:

A

Hematoxylin

25
Q

Dye has the chromophore associated with the acid radicle (anions; -):

A

Acidic or anionic stain

26
Q

structures in the cell or tissue that love acid stains

e.g. proteins – large number of basic groups (cations; +) associated with the side chains

A

Acidophilic substances (eosinophilic substances) –

27
Q

red to pink acid stain?

A

Eosin

28
Q

a. a stain for connective tissue (collagen) rather than cells
b. e.g., Masson’s, Mallory’s

A

Trichrome stain

29
Q

a. a stain for the elastic fibers or elastic tissue in connective tissue
b. e.g., aldehyde fuchsin; orcein; resorcin-fuchsin

A

Elastic stains

30
Q

a. a stain for reticular fibers in connective tissue; also used in staining cells of the central nervous system
b. connective tissue fibers love silver (argyrophilic) and stain black

A

Silver impregnation stains

31
Q

Nucleic acids (DNA and RNA) stains:

A

Feulgen staining reaction

luekofuchsin (shiff reagent) –> aldehyde shiff (product, colored)

32
Q

Carbohydrate (e.g., glycogen) stain

A

Periodic acid-Schiff reaction (PAS)

33
Q

Fat stains:

A

a. Oil red O (stains fats red) and Sudan black (stains fats black) commonly used
b. soluble in both alcohol and fats

34
Q

Protein stains?

A

a. Specific stains for amino acids or groups of amino acids available, but no longer used
b. Immunocytochemistry is used extensively for localizing specific proteins in cells or tissues