Body tissue-epithelia/connective tissue

Question 1

What is the Epithelial tissue?

Answer 1

Densely arranged layers rich in cells
Arranged as Sheets or glands

Question 2

Name 6 properties of epithelial tissue

Answer 2

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)

Question 3

4 Functions of epithelial tissue? and an example of each

Answer 3

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

Question 4

What are the 2 types of epithelial tissue?

Answer 4

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

Glandular epithelium - follicles in endocrine and exocrine glands

Question 5

How do epithelia attatchment to connective tissue?

Answer 5

Via the basement membrane

Question 6

How do Epithelia obtain nutrients ?

Answer 6

Through basement membrane

Question 7

What is the extracellular matrix

Answer 7

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

Allows flexible strength to tissues

Question 8

What is the extracellular matrix made up of

Answer 8

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

Question 9

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

Answer 9

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

Question 10

Explain collagen structure

Answer 10

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

Question 11

Explain a elastin structure

Answer 11

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

Question 12

NAme 3 functions of connective tissue

Answer 12

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

Question 13

Name 3 main categories ( types of connective tissue )

Answer 13

Blood
Bone
Fibrous connective tissue

Question 14

Name 5. types of fibrous connective tissue and an example

Answer 14

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 )