Session 3 ILO's - Tissues, organs, systems and epithelial tissue

Question 1

Define ‘tissue’

Answer 1

A collection of cells that are adapted to perform a specific function.

Question 2

Define ‘organ’

Answer 2

Two or more tissues combined to create a structural unit that has a
particular function that are a sum of its parts.

Question 3

Describe how cells are held together at the molecular level

Answer 3

Cell are held at the lateral surface to other cells and to the basal lamina
1. Cell-cell adhesion molecules
2. Extracellular matrix proteins (fibres) e.g. collagen fibres
3. Internal scaffolding
4. Close proximity (pressure effects holding layers together)

Question 4

describe the structural relationships between the epithelia and closely associated tissues - glands, underlying connective tissue (lamina propria and muscularis mucosae)

In the gastrointestinal, urinary, and respiratory mucosae

Question 5

discuss, for the gastrointestinal, urinary, and respiratory mucosae, how the structure of their constituent tissues is related to the function of the mucosa