connective tissue

Question 1

where does CT arise from

Answer 1

Mesoderm

Question 2

name the 3 types of CT fibres

Answer 2

collagen, reticular, elastin

Question 3

Where is collagen made and what are its uses

Answer 3

Made from fibroblasts and uses are: cushioning, strength, found info cartilage, tendons, ligaments

Question 4

Structure of collagen

Answer 4

3 chains of alpha helices, rich in glycine and proline

Question 5

Reticular: what is it made from and its uses

Answer 5

Made from fibroblasts, are short fibres, in lymph nodes and bone marrow. They produce scaffolding that cells can grow through

Question 6

Elastic fibres: where is it found

Answer 6

bundles of elastin found in ECM and smooth muscle cells in arteries

Question 7

Structure of elastin fibres

Answer 7

Held together by cross bridges, stretch and recoil

Question 8

What are fibroblasts and their features

Answer 8

Fibroblasts are active. Round, euchromatic nucleus, lightly stained, abundant in cytoplasm, lots of RER e.g. found in umbilicus

Question 9

What are Fibrocytes

Answer 9

Inactive, flat, heterochromatic nucleus, scant cytoplasm, little RER e.g. found in tendons

Question 10

what are adipocytes and their features

Answer 10

fat cells
contain lots of SER and pinocytis vesicles for endocytosis
have sleeve of collagen 3 as a coat
Are negatively charged and retain Na + and other ions. Have pockets that can store water. Can from gels

Question 11

Difference between white and brown fat cells?

Answer 11

White: Uniocular, one large fat droplet, nucleus to the side
Brown: multiocular, many smaller droplets

Question 12

Use of thyroid hormones?

Answer 12

Liberty fat from cells to be metabolised

Question 13

What are GAGs

Answer 13

Glycosaminoglycans (GAGs) are long unbranched polysaccharides consisting of a repeating disaccharide unit. Examples: Hyaluronic acid, Chondroitin sulphate, Heparin sulphate, keratan sulphate