Body tissue-epithelia/connective tissue Flashcards

1
Q

What is the Epithelial tissue?

A

Densely arranged layers rich in cells
Arranged as Sheets or glands

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2
Q

Name 6 properties of epithelial tissue

A

SCALD A

Sheet or gland arrangement of cells
Constantly regenerate
Attach by a basement membrane to connective tissue
Little extracellular matrix
Densely packed cells

Avascular (nutrients thru basement membrane)

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3
Q

4 Functions of epithelial tissue? and an example of each

A

PASSE

Protection - e.g. tough skin
Absorption - e.g. epithelium of gut and lung
Secretion - e.g. Mucus, sweat
Sensory- e.g. epithelial structures on ear, nose, eye, skin
Excretion - e.g. waste products in kidney

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4
Q

What are the 2 types of epithelial tissue?

A

Membranous epithelium - lines blood vessels, lymphatic vessels, respiratory tract, digestive tract (oesophagus)

Glandular epithelium - follicles in endocrine and exocrine glands

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5
Q

How do epithelia attatchment to connective tissue?

A

Via the basement membrane

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6
Q

How do Epithelia obtain nutrients ?

A

Through basement membrane

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7
Q

What is the extracellular matrix

A

Outer shell of mammalian cells
Low in epithelial tissue
High in Connective tissue
Made of proteins mostly

Allows flexible strength to tissues

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8
Q

What is the extracellular matrix made up of

A

Low epithelial tissue
Hight connective tissue
Made mostly of proteins
- collagen ( mostly )
- elastin
- glycoproteins
- Integrin

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9
Q

Name the 4 main proteins in the extracellular matrix
and what they do

A

Collagen ( the main structural protein)- strong /flexible
Elastin - elastic and flexible, in coils
Glycoproteins - - fibronectin/laminin - attach collagen
Integrin - attaches ECM parts

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10
Q

Explain collagen structure

A

3 collagen strands twist ->-fibrous molecule
Fibrous molecules twist –> fibril
Fibrils twist in groups –> rope like collagen fibers

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11
Q

Explain a elastin structure

A

random coils held together by microfilaments (coiled so can stretch )

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12
Q

NAme 3 functions of connective tissue

A

Support to organs and body ( eg bone )
Transport to tissues/organs ( eg blood)
Defence against foreign invaders ( eg bacteria )

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13
Q

Name 3 main categories ( types of connective tissue )

A

Blood
Bone
Fibrous connective tissue

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14
Q

Name 5. types of fibrous connective tissue and an example

A
  1. Loose fibrous connective tissue ( connects structures in body )-thick gel like ( hyaluronic acid )
  2. Dense regular eg -tendons (collagen bundles ) or elastin bundles ( in arteries )
  3. Dense irregular ( outer muscle layers )
  4. Reticular ( bone marrow)
  5. Adipose ( fat )
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