| A. Cellular level of organisation |
1. organs associated to form functional systems
|
|
B. Tissue level of organisation |
2. tissues are
grouped together to form organs |
| C. Organ level of
organisation |
3. Some division of labour among the
cells |
| D.
Organ system level of organisation |
4. cells are
arranged as loose cell aggregates |
|
|
5. cells performing the same function are
arranged into tissues |
