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MEDSCI201 > Histology > Flashcards

Histology Flashcards

1
Q

Stratified

A

Many layers
Found where protection is important
Found in skin, oesophagus, urethra, bladder

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2
Q

Simple

A

Single layer
Found in areas of absorption and filtration. Lining of body’s cavities

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3
Q

Simple squamous epithelium (Mesothelium)

A

Single layer, thin epithelia
Alveoli of lungs. Lines cavities e.g peritoneal, peritoneum

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4
Q

Simple sqaumous (endothelium)

A

Lining of heart and blood vessels

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5
Q

Simple cubiodal

A

Large surface area
Secretion and absorption
Glands and Ducts

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6
Q

Simple columnar

A

Elongated nuclei, lower in cell
Collecting ducts of kidneys, lining of stomach

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7
Q

Simple pseudostratified

A

Lining of nasal cavity, bronchi
Protection and secretion

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8
Q

Stratified squamous

A

Surface of skin, oral cavity
Physical protection against abrasion, pathogens and chemical attack

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9
Q

Stratified cuboidal

A

Lining of some ducts (rare)
Sweat duct gland
Protection, secretion, absorption

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10
Q

Stratified columnar

A

Mammary glands, salivary glands
Protection

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11
Q

Stratified Transitional

A

Urinary bladder
Permits expansion and recoil after stretching

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12
Q

Tight junctions

A

Prevents movement of molecules between cells and prevents movement of apical or basal proteins. Have interlocking proteins called zonula occludens and adherens

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13
Q

Zona Occludens

A

Scaffolding proteins for the assembly of tight junction complexes and provide link with cytoskeleton

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14
Q

Zona Adherens

A

Stabilise cell to cell contact.
Regulate actin cytoskeleton
Regulate cell signalling
Contraction pulls microvilli apart, makes it easier for molecules to get down and be absorbed by the cell

Has transmembrane proteins E-cadherin connection to B-catenin

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15
Q

Desmosomes

A

Linking epithelial cells together and provide strength to layers. Has organized network of keratin

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16
Q

Gap Junctions

A

Pore - allows movement of molecules
Has 6 connexins form connexon. 2 connexons in adjoining cells

17
Q

Hemidesmosome

A

Attach to ECM. Contains integrins as the transmembrane attachment protein. Attaches to intermediate filaments

18
Q

Lamina propria

A

Produced by ECM. Loose areolar connective tissue
Lamina fibroreticularus - fibronectin

19
Q

Basal lamina

A

Produced by epithelia
Lamina lucida - laminin
Lamina densa - collagen IV

20
Q

Microvilli

A

Membrane extensions containing microfilaments. Made of actin proteins and increase surface area

21
Q

Stereocilia

A

Membrane extension containing microfilaments. Contain actin filaments and often longer and thicker. Sensory hair cells of inner cells

22
Q

Cilia

A

Contain microtubules. Made up of tubulin. 9 pairs of tubules, 2 central tubules. Involved in movement of materials e.g resp tract

23
Q

Acinar

A

Large bulbous collection within a small lumen

24
Q

Tubular

A

Cells of consistent shape that form a uniform tubular lumen

25
Q

Unicellular glands

A

Goblet cells - mucus - lubrication of epithelial layer - protection

26
Q

Simple Tubular

A

Intestinal glands

27
Q

Simple coiled tubular

A

Eccrine sweat glands

28
Q

Simple branched tubular

A

Gastric glands

29
Q

Simple alveolar (acinar)

A

Not found in adult

30
Q

Simple branched alveolar

A

Sebaceous (oil) glands

31
Q

Endocrine

A

Released into bloodstream - acts within the body

32
Q

Exocrine

A

released via a duct onto an epithelial surface e.g sweat, sebum

33
Q

Merocrine

A

Secretion via exocytois
No part of the gland is lost or damaged
Salivary glands

34
Q

Apocrine

A

Budding of off extracellular membrane-bound vesicles
Cell loses part of its cytoplasm during secretion. Mammy galnds

35
Q

Holocrine

A

Released via rupture of plasma membrane, destroying cell
Sebaceous glands

MEDSCI201 (20 decks)

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