1. What is a system?
System – a group of bodily organs that function together to maintain homeostasis and thus, the survival of the organism.

2. Biological Levels of Organization

3. Organelles
Small cellular structures that perform metabolic functions for the cell.

4. Cell
Most basic unit of all living things

5. Tissue
A group of similar cells that performs a specific function.

6. Organ
Formed of two or more tissues and carries out a specific function.

7. Organ Systems
A group of organs that work together to perform a vital body function
E.g., the nervous system.

8. Systems Can’t Work Alone

9. The Cell

10. Cell Theory
All living organisms are composed of cells. They may be unicellular or multicellular.
The cell is the basic unit of life.
Cells arise from pre-existing cells.

11. Two main types of Cells Prokaryotes bacteria and archaea Eukaryotes
animal, plant, and fungal cells

12. Animal Cell

13. Plant Cell