Target: Blood system
Analogue: School

T : Artery
A : Team leader

T : Arteriole
A : Deputy team leader(or similar)

T : Capillaries
A : Classroom teacher

T : Cells
A : Pupils

T : Blood( with the 'contents')
A : Information(various)

T : Heart
A : Headteacher(or Senior Management Team)

Where analogy breaks down : Blood flows one way: Artery->
Arteriole -> capillaries -> Veules -> Vein but information flows
from leader to deputy to form tutor to pupils and then feedback and
any other information from pupils to tutor to deputy to leader.

If anyone can refine this you are most welcome to make changes.
Puni