1. Organization of Organisms
Objective 41

2. Objective 41: I can describe the hierarchical organization of multicellular organisms

3. Specialized Cells: Cells are the smallest unit of LIVING things.
Cells that perform specific functions in multicellular organisms (muscle cells, skin cells, brain cells – all have different functions and jobs)

4. Tissues
A group of specialized cells working together for a specific function.
Examples:
Muscle Tissue
Nervous Tissue
Connective Tissue
Epithelial tissue

5. Organs
A group of similar tissues that perform a similar, specific, and often complex function
Examples
Heart
Liver
Kidneys
Brain
Stomach
Skin

6. Organ System
A group of organs that work together to perform a major function
The human body as over 9 different major organ systems
Examples:
Nervous System
Circulatory System
Respiratory System
Digestive System
Excretory System
Immune System
Muscular System
Skeletal System
Endocrine System

7. Multi-Cellular Organisms
Several organ systems working together to perform life functions make up a multi-cellular organism.

8. Hierarchy of Multicellular Organisms
Specialized Cells Tissues Organs Organ Systems Organism