1. From Cells to Systems Learning Objectives: Review the signs of life.
Describe how organisms are organised.
Name some human organs and organ systems.
Name some plant organs.

3. How is the body organized?
To understand how the body is organized,
think about how a school is organized..
A school needs to be very organized. Every pupil in the school needs to know where
they should be and what they
are doing. However...
Not all pupils study the same subjects.
Not all pupils can work together efficiently.
There is not room for all the pupils to be in the same place.

4. How is the body organized?
A school is made up of an organized system.
Individual pupil
Registration group
Subject class
Year group
School

5. How is the body organized?
Living things are made up of organized systems.
Each specific cell is grouped with cells similar in structure and function to form a tissue.
cells
tissue

6. How is the body organized?
Cells are the
basic units of
life.
Groups of cells
work together
to form tissues.
Groups of tissues work together to form organs.
cell
tissue
organ

7. How is the body organized?
Groups of organs form systems.
For example, the human digestive system is made up of several organs including the mouth, gullet, stomach and small intestine.
The different organs in a system are linked together by tubes or vessels.
What other human body systems can you think of?

8. How is the body organized?
The body is made up of different organ systems working together to carry out all the functions of a living organism.
Both the body and schools are organized systems:
cell
pupil
tissue
registration group
organ
subject class
organ system
year
organism
school

9. Cells, tissues, organs and systems
Basically, all living things are made up of cells…
A group of CELLS makes up a TISSUE
A group of TISSUES makes up an ORGAN
A group of ORGANS makes up a SYSTEM
A group of SYSTEMS make up an ORGANISM

10. Here’s another example in humans:
Muscle cells
Muscle tissue
Organ
System
Organism

11. WARNING! IF YOU ARE SQUEEMISH!

12. lung

13. heart

14. skin

15. brain

16. kidney

17. stomach

18. appendix

19. Liver from a calf

20. trachea

21. Plants also have organs