1. The Hierarchy of Structure in Animals

2. Levels of Organization in the Animal Body

3. Increasing levels of complexity
Cell – simplest unit of life
Tissue – a collection of similar cells that perform a function
Organ – a structure composed of different tissues working together to perform a complex body function
Organ System – a system of one or more organs and structures that work together to perform a major body function such as digestion.

4. Animal Tissue Types Found in bones and tendons
Function is to support and insulate
Found in skin and digestive tract
Function is to protect surfaces from dehydration.

5. Animal Tissue Types Found in brain and spinal cord
Nervous Tissue
Found in brain and spinal cord
Function is to communicate with the body.
Found in muscles, digestive tract and heart.
Function is movement.