3 Integrating Cells Into Tissues And Organs

Question 1

What are the features of connective tissue?

Answer 1

Extracellular matrix plentiful
Cells sparsely distributed within it
Rich in collagen

Question 2

What are the features of epithelial tissue?

Answer 2

Cells bound together into sheets - epithelia
ECM barely sufficient, thin basal laminators underlies epithelium
Cell-cell adhesions
Junctions tie surfaces of cells to each other or to basal lamina
Microfilaments stop cells losing shape

Question 3

Epithelial cells tight junctions (lateral)

Answer 3

Near apical
Long cell to cell fusion point
Prevents movement of larger molecules into deeper tissue layers of organ
Seals cells together to prevent leakage

Question 4

Epithelial cells adhesion junctions (lateral)

Answer 4

Keeps sheets of cells together
In pairs
Belt of adhesion
Tissue stabilising factor
Transport barrier
Joins actin bundle in pone cell to similar bundle in neighbouring cell

Question 5

Epithelial cells desosome (lateral)

Answer 5

Strong
Halfway down cells
Random
In tissues that have intense mechanical stress
Cytokeratin fibres intracellularly
E-cadherins intercellularly
Mechanical strength
Joints intermediate filaments in cell to those in neighbour

Question 6

Gap junctions

Answer 6

Close to base
Cardiac and smooth muscle
Quickly communicate
Allows free movement of small water soluble ions and molecules

Question 7

Which organs contains all 4 types of tissue

Answer 7

Mucosal membrane