organisation

Question 1

Define cell

Answer 1

smallest unit of a living organism

Question 2

Define tissue

Answer 2

Group of similar cells that perform an overall function

Question 3

Define organ

Answer 3

several different tissues to perform an overall function

Question 4

Define organ system

Answer 4

Group of organs to form a larger function

Question 5

What’s a basement membrane ?

Answer 5

a specialised thin non-cellular layer of extracellular matrix. it sits between epithelial or endothelial cells and the underlying connective tissue, separating out the layer

Question 6

composition of basement membrane

Answer 6

collagen, laminin ( a structural glycoprotein ) proteoglycans

Question 7

function of basement membrane

Answer 7

support provides structural support and other proteins to overlying cells and tissues

Question 8

selective barrier - acts as a

Answer 8

selective filter , controlling the movement of molecules between epithelial layer and underlaying tissue. for example in the kidney, the glomerular basement membrane prevents large proteins.

Question 9

cell signalling plays a role in

Answer 9

cell influencing cell behaviour , migration differentiation
- tissue repair and regeneration

Question 10

Whys blood considered a connective tissue ?

Answer 10

connects diff parts of the body transporting things between them. ( co2. o2 haeomoglobin )

Question 11

What makes blood unique compared to other tissues ?

Answer 11

because of its fluid extracellular matrix
- plasma entirely liquid

Question 12

use of tissues in research and development

Answer 12

scientists use animals and isolated tissues for study
- development and disease in lab
- drug discovery and development in industry
- gene and cell therapies
- tissue engineering

Question 13

types of animal tissues used in vitro

Answer 13

whole animals
isolated organs
tissue culture
stem cell cultures
organoids