1. How Body is Organized

2. Levels of Organization
Cells
Tissues
Organs
Organ Systems

3. Cells
A cell is the basic unit of structure and function in a living thing.
The cell membrane forms the outside boundary of the cell.
Inside the cell membrane is a large structure called the nucleus.

4. Tissues A group of similar cells that perform the same function.
The human body contains four basic types of tissue.
Muscle Tissue-Contracts
Nerve Tissue-Transmits Messages
Connective Tissue-Support and Connects
Epithelial Tissue-Lines Organs

5. Organs
An organ is a structure that is composed of different kinds of tissue.
The job of an organ is more complex than that of a tissue.
The heart is an example and contains all four kinds of tissue.

6. Organ Systems Circulatory-Transports substances, fights disease
Digestive-Breaks down food and absorbs materials.
Endocrine-Controls body processes by chemicals (hormones)
Excretory-Removes wastes
Immune-Fights Disease
Muscular-Enables the body to move
Nervous-Detects & Interprets information
Reproductive-Create Offspring
Respiratory-Takes in O2 and eliminates CO2
Skeletal-Supports and Protects the Body. Allows Movement
Skin-Keeps the water in the body/Regulates Body Temp.