epithelial and connective tissue

what are the cell junctions called?

tight junctions, adhernes junctions, desmosomes, hemidesmosomes and gap junctions

1 of 29

features of tight junctions

strands of trans-membrane proteins fuse together at the outer surfaces of cells,it seals the passageways between cells and is fund in the stomach, intestine and bladder

2 of 29

features of adhernes junctions

plaque protein anchors membrane proteins to cytoskeleton. cadherins are a transmembrane glycoprotein that joins adjacent cells and helps resist cells separating under mechanical stress such as peristalsis

3 of 29

features of desmosomes

like adherens contain plaque protein and cadherins the plaque attaches to intermediate filaments in cells (keratin)

4 of 29

features of hemidesmosomes

these don't link to adjacent cells but attach cell to extracellular fluid , they contain integrin trans-membrane glycoproteins (not cadherins) and anchor to basement cells

5 of 29

features of gap junctions

cells connected by connexons (fluid filled transmembrane holes made from connexins) allows the diffusion of ions and small molecules, it provides electrical coupling between cells ( important for muscle contraction)

6 of 29

what are the functions of epithelia?

1) form selective barriers 2)provide secretory surfaces 3) provide protective surfaces

7 of 29

what does the basement membrane consist of?

it consists of two extracellular layers 1) basal lamina, contains laminin and collagen 2) reticular lamina contains fibroblasts which secrete collagen

8 of 29

There are two types of glandular epithelium. what are they? and what is their function

Endocrine and Exocrine their function is secretion

9 of 29

what is the difference between endocrine and exocrine?

ENDOCRINE secretions enter interstitial fluid and diffuse directly in to the blood stream. EXOCRINE secretions are released in to a duct which then empty on to a surface epithelium or lumen for example sweat or salivary glands

10 of 29

where can u find 1) pseudostratified columnar 2) simple cuboidal 3) simple columnar 4) starified squamous 5) Glandular 6) simple squamous 7)transitional 8) stratified columnar

1) trachea 2) kidney 3) digestive organs 4)skin 5)salivary glands 6)lungs 7)bladder 8) mammary ducts

11 of 29

what is the functions of connective tissue?

-bind tissue together -support and strengthen tissue -protect and insulate internal organs -compartmentalize and transport -energy reserves and immune responses

12 of 29

what is connective tissue derived from?

mesenchyme

13 of 29

what are the features that all connective tissue have?

sparse cells and extracellular matrix

14 of 29

what is extra cellular matrix?

non-cellular materiallocated between and aroound the cells contains protein fibers and ground substance (fluid,semifluid,gelatinous or calcified

15 of 29

what is the numerous cells of connective tissue and what does it secrete?

fibroblasts which secrete protein fibers such as collagen,elastin and riticular fibers

16 of 29

what are the other common connective tissues and their functions?

chondrocytes-make cartilaginous C.T, adipocytes-store triglycerides, osteocytes-make bone and blood

17 of 29

What are the classes of mature connective tissue?

loose,dense,cartilage,bone and liquid

18 of 29

what are the sub types in loose connective tissue?

Areolar connective tissue, Adipose connective tissue and reticular connective tissue

19 of 29

Areolar connective tissue...

used to attach skin and under lying tissues and as a packing between glands,muscles and nucleus

20 of 29

Adipose connective tissue....

located in subcutaneous layer, around organs and joints- reduces heat loss, is a store of energy and serves as padding

21 of 29

Reticular connective tissue ...

network of interlacing reticular fibers and cells, form's a scaffolding used by lymphoid tissues such as the spleen and lymph nodes

22 of 29

Dense irregular connective tissue.....

mainly contains fibroblasts and collagen fibers randomly arranged- provides strength when forces are pulling from many different directions

23 of 29

Dense regular connective tissues...

comprise of tendons, ligaments and other strong attachments where the need for strength along one axis is mandatory

24 of 29

Elastic connective tissue ...

mainly fibroblasts and freely branching elastic fibers- allows stretching for certain tissues i.e arteries

25 of 29

Cartilage...

A tissue with poor blood supply that grows slowly when injured or inflamed. There are three types of cartilage hyaline,fibro and elastic

26 of 29

hyaline cartilage .....

is the most abundant cartilage covers the ends of long bones and parts of the ribs,nose,trachea, bronchi and larynx, it provides a smooth surface for joint movements

27 of 29

Fibrocartilage ...

Has thick bundles of collagen fibers is a strong, tough cartilage. fibrocartilage disc's in the invertebral spaces and in knee joints support huge loads up an down the long axis of the body

28 of 29

elastic cartilage...

consists of chondrocytes located in a thread like network of elastic fibers- makes up malleable part of the outer ear.

29 of 29

Get Revising

epithelial and connective tissue

Other cards in this set

Card 2

Front

Back

Card 3

Front

Back

Card 4

Front

Back

Card 5

Front

Back

Comments

Similar Biology resources: