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IMS 1 > S2- Cells > Flashcards

S2- Cells Flashcards

1
Q

Tissue is a…that have a…
They are absent in…

A

Group of cells (level of organisation)
Similar structure and function
Unicellular organisms

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2
Q

Mesenchymal cells are…and can differentiate all different….cells to form different types of….

A

Stem cells that are pluripotent
Progenitor cells (descendants of stem cells that then further differentiate to create specialized cell types)
Connective tissue

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3
Q

Mature connective tissue formed from mesenchymal cells are…

The mesenchyme is…and…together

A

Bone, cartilage and muscle

Extracellular matrix produced by mesenchymal cells (rich in hyaluronic acid) + the mesenchymal cells

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4
Q

The mesenchyme is an….connective tissue from which other…can form during…

A

Embryonic
Connective tissues
Embryogenesis

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5
Q

Stroma is the….of an organ
It contains….

Its appearance can change with…

A

Supporting tissue (plays structural role)
Fibroblasts, vasculature, lymph

Cancer (desmoplasia) or injury (reactive stroma)

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6
Q

Stoma is separate from….

A

Parenchyme (where functioning cells of organ are)

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7
Q

Organ is a…

A

Differentiated structure of group of cells that perform same function

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8
Q

When looking at tissues, 2 stains used are:

A
  1. Eosin (negatively charged acidic dye= pink/ red). Include cytoplasmic proteins structures
  2. Haematoxylin (haematein) (stain acidic structures purple). Include DNA, RNA in ribosomes and RER (phosphate group makes them acidic)
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9
Q

7 shared features of epithelial cells:

A
  1. Continuous (unlike connective)
  2. Retain polarity (have apical, lateral and basal surfaces)
  3. Intracellular junctions connect them
  4. Supported by lamina propria (connective tissue)
  5. Do not contain blood vessels (nutrients diffuse across basal/ apical surface)
  6. They have potential to regenerate
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10
Q

In epithelial, cells are joined together by…and they maintain…between apical and basal side

A

Intercellular junctions
Polarity

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11
Q

5 types of epithelial junctions are…

A
  1. Tight junction
  2. Adherens junction
  3. Desmosome junction
    (4. Hemi-desmosome junction)- not in slide
  4. Gap junction
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12
Q

Loss of cell-cell adhesion between epithelial cells causes 2 diseases:

A
  1. Bullous pemphigoid (rare/ affects old people)= autoimmune subepidermal blistering
  2. Pemphigus vulgaris = autoimmune intraepidermal blistering disease
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13
Q

Adult cell types:

A
  1. Labile= high turnover (ie: bowel, skin, bone marrow)
  2. Stable= ability to regenerate but lower turnover (hepatocytes/ liver= 3months, bone)
  3. Permanent= once its gone its gone= cell loss replaced by scarring (nerve, cardiac and skeletal)
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14
Q

Mitosis/ cell division is also known as….

A

Proliferation

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15
Q

2 types of epithelia:

A
  1. Simple= one layer
  2. Stratified= more than one layer
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16
Q

4 types of simple epithelia:

A
  1. Simple squamous= flat central nuclei
  2. Simple cuboidal= round central nuclei
  3. Simple columnar= ovoid, basal nuclei
  4. Pseudo-stratified columnar= columnar cells of different heights= gives stratified appearance
17
Q

4 types of stratified epithelia:

A
  1. Stratified squamous (keratinised and nonkeratinised)
  2. Stratified cuboidal
  3. Stratified columnar
  4. Transitional (change shape)= apical cells dome-shaped when relaxed and flattened when stretched
18
Q

Difference between stratified squamous keratinized and nonkeratinized epithelium

A

Keratinised= apical cells dead (no nucleus or cytoplasm) and flaky and filled with keratin. Cuboidal cells produced at basal end (bottom)

Nonkeratinised= apical cells living and very flat, and basal cells cuboidal

19
Q

3 epithelial site-specific adaptations:

A

1.keratinised stratified squamous= skin (top layer dead and flakes off/ keratin contains waterproof properties= protect against abrasion and water loss)

2.simple columnar epithelial with cilia on apical surface= GI tact and female reproductive organ

  1. Transitional stratified epithelium in urothelium in urinary tract (ability for bladder to stretch to increase vol. + tight gaps to limit transcellular and paracellular permeability (impermeable to water and ions)
20
Q

3 histological layers of urothelium:

A
  1. Apical=umbrella cells that form an impermeable barrier
  2. Intermediate= 2/3 layers of polygonal cells (polygon shaped)
  3. Basal= 2/3 layers of small cuboidal cells
21
Q

Mesoderm is the….between endoderm and ectoderm that appears….

A

Middle layer
Early in development of embryo

22
Q

7 major cell types derived from mesoderm are:

A
  1. Fibroblasts= form connective tissue such as capsules/ tendons/ ligaments
  2. Mesothelium= single layer cuboidal cell lining of cavities (synovial cavity of knee joint)
  3. Endothelium= inner surface of vessels (arteries/ lymphatics)
  4. Adipocytes= store lipids
  5. Myoblasts= form muscle (skeletal/ cardiac/ smooth)
  6. Chondroblasts= form cartilage
  7. Osteoblasts= form bone
23
Q

5 main mesenchymal tissues:

A
  1. Adipose= steatocytes that store fat + ‘brown fat’ for more energy in foetus and infants
  2. Tendons= collagen fibres from fibroblasts= tensile strengths but flexible
  3. Muscle= skeletal, cardiac (striated), and smooth
  4. Bone= 3 major cell types
  5. Cartilage= mainly collagen and have 3 types
24
Q

3 types of bone cells/ tissue and 3 types of cartilage:

A
  1. Osteoblasts= divide + new cells
  2. Osteoclasts= macrophage like function + reduce bone in remodelling process
  3. Osteocytes= inert and inactive but regulate remodelling of skeleton

1.hyaline cartilage= form synoval lining of joint (barrier that lines inside of joints)
2. Fibrocartilage= stiff, durable and connects bones
3. Elastic cartilage (2 types)= elastic fibres interwoven and present in external structure like ear/ nose/ epiglottis

25
Q

Marfan syndrome is an…that changes protein that makes…
It leads to problems in development of…which supports…

A

Inherited or acquired genetic disorder
Healthy connective tissue
Connective tissue
Bones, muscle, tissue, organs etc.

26
Q

2 hallmarks of coeliac’s disease:

And 3 key features of the disease are:

A
  1. Breakdown of epithelial barrier
  2. villous atrophy
  3. Intraepithelial lymphocytes
  4. Lamina propria inflammation
  5. Villous atrophy
27
Q

Stages in cell cycle:

A

Interphase=
G0 (at the start of G1)= resting stage= cell performs functions and is not prepared to divide, G1= cell growth, S= DNA synthesis
G2= more growth= preparation for mitosis

Mitosis= PMAT

28
Q

All cells have same cell cycle length but different….which determines how often they divide

A

G0 lengths

29
Q

Spindle fibres are formed and attach to…at the…stage of mitosis

A

Centromeres of sister chromatids
Prophase

30
Q

Meiosis goes through…twice

A

PMAT (but without interphase the second time/ DNA only replicates at the start)

31
Q

The intestinal epithelium limits the…
In coeliac’s disease, the immune response damaged the…and increase…

A

Host-luminal interactions and maintains gut homeostasis

Coeliac mucosa
Intestinal permeability

32
Q

In coeliac disease, the immune cells have a greater access to…which increases…

A

Gluten
Pro-inflammatory immune response against gluten (more epithelial damage)

33
Q

Lamina propria is…

A

The lamina propria is a layer of loose connective tissue directly localized underneath the epithelium and populated with a variety of specialized immune cells including T lymphocytes,

34
Q

Crossing over happens during the…stage
And….chromosomes are made

A

Prophase 1
‘Recombinant’

IMS 1 (14 decks)

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