1. How is the animal body organized?

2. Organization of Animals
specialized cells are organized in a hierarchy. Levels of organization of increasing or decreasing order.
Example: white-tailed deer.

3. Ex. Increasing hierarchy of structure within a person:
Cell
Heart muscle cell
Tissue
Heart Tissue
Organ
Heart
Organ System
Circulatory System
Organism
Human

4. Cell – the basic unit of life. Smallest unit

5. Tissue – a collection of similar cells that
perform a particular, but limited, function.
Ex: epithelial tissue (skin), connective tissue, muscle tissue, and nerve tissue.
Nerve tissue

6. Cell
Tissue
Organ – two or more types of tissue that work together to perform a complex life function.
Ex: stomach - made up of smooth muscle, longitudinal muscle and circular muscle.

7. Organ System – groups of organs working
Cell
Tissue
Organ
Organ System – groups of organs working
together to perform a vital
life function
Ex: digestive system has many organs : tongue, trachea, stomach, liver and intestines

8. Organism – two or more organs which function together for life
Cell
Tissue
Organ
Organ System
Organism – two or more organs which function together for life

9. Label the human organ systems and their functions
To do now:
Label the human organ systems and their functions
Pg 70