Epithelial Tissue Flashcards

1
Q

Epithelial Tissue

A
  • many cells tightly packed together ~ little to no extracellular matrix
  • densely packed sheets of cells
  • Many cell junctions
  • Attach to basement membrane
  • Avascular —no blood vessels - HAS a nerve supply
  • Mitosis occurs frequently
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2
Q

Apical (free) surface

A

faces outside world

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3
Q

Lumen

A

hollow space (food , water)

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4
Q

Basal surface

A

Bottom

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5
Q

Basement Membrane

A

basal+reticular lamina ; formed by underlining epithelial + connective tissue

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6
Q

Simple

A

1 layer of cells

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7
Q

Pseudostratified

A

falsely; not every cell reaches apical surface, nucleus at different levels

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8
Q

Stratified

A

2+ rows of cells

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9
Q

Squamous

A

Flat “floor tiles”

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10
Q

Cuboidal

A

Squared

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11
Q

Columnar

A

Long columns

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12
Q

Transitional

A

Functional classification, shape changes based on function

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13
Q

Simple squamous function

A

• Filtration • Diffusion • Secretion

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14
Q

Simple squamous location

A

• Cardiovascular + Lymphatic
• Serous membranes
• Alveoli
• Kidneys
• inner eardrum

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15
Q

Simple cuboidal function

A

• Secretion • Absorption

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16
Q

Simple cuboidal location

A

• Ovary
• Eye Lens
• Eye Retina
• Kidney tubules
• Thyroid gland
• Pancreas

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17
Q

Simple cilliated columnar function

A

• Cilia —moves
mucus toward throat away from
lung; coughed up/ swallowed/spit out
• move oocytes from ovaries —> uterus

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18
Q

Simple non-cilliated columnar function

A

• Absorption • Secretion

19
Q

PSUEDOSTRATISFIED CILLIATED COLUMNAR function

A

• Goblet cells Secrete mucus • Cilia sweeps away mucus

20
Q

PSUEDOSTRATISFIED CILLIATED COLUMNAR location

A

Respiratory tract

21
Q

PSUEDOSTRATISFIED NON-CILLIATED COLUMNAR function

A

• Absorption • Secretion

22
Q

PSUEDOSTRATISFIED NON-CILLIATED COLUMNAR location

A

• epididymis
• gland ducts
• male urethra

23
Q

Stratified squamous function

A

Protection

24
Q

Stratified squamous location

A
  • Keratinized —
    • intracellular protein
  • Non-keratinized —
    • deep ; moistened by
    mucus
25
Q

Stratified cuboidal function

A

• Protection • Secretion • Absorption

26
Q

Stratified cuboidal location

A

• Sweat gland
• esophageal glands
• male urethra

27
Q

Stratified columnar function

A

• Protection • Secretion

28
Q

Stratified columnar location

A

• urethra
• esophageal glands
• anal mucous membrane
• conjunctiva of eye

29
Q

Translational function

A

• organs stretch
• maintain lining
• Holds varying fluid without rupturing

30
Q

Translational location

A

• urinary bladder
• ureters
• urethra

31
Q

Gland

A

a single cell or a mass of epithelial cells adapted for secretion

32
Q

Unicellular

A

Single cell

33
Q

Multicellular

A

Many cells

34
Q

Endocrine gland secretion

A

enter interstitial fluid + diffuse into bloodstream

35
Q

Exocrine gland secretion

A

enter ducts ; empty onto surface of epithelium

36
Q

Unbranched duct

A

Simple

37
Q

Branched duct

A

Compound

38
Q

Secretary portion
Tubed shaped

A

Tubular

39
Q

Secretary portion
Round shaped

A

Aciner

40
Q

Secretary portion
Round + tube shape

A

Tubuloacinar

41
Q

Merocrine glands

A

released from cell in secretory vesicles via exocytosis

42
Q

Apocrine glands

A

portion of the cell pinches off by exocytosis

43
Q

Holocrine glands

A

As cell matures, it ruptures and becomes secretory product