1. Organization of Multicellular Organisms
How do different structures carry out the functions of life?

2. Specialized Cells The cell is the smallest unit of life
Different cells are specialized to carry out specific functions
Ex: Nerve Cells are long with many projections that connect to other nerve cells and transmit signals around the body

3. Tissues
Groups of similar types of cells that work together to carry out specific tasks in multicellular organisms
Ex: Nervous tissue – carries messages to and from the brain

4. Organs
Different groups of tissues working together to perform a particular job
Can be made up of several different tissue types
Ex: The Brain – made of nerve tissue, connective tissue, epithelial tissue, etc.
Function: Control center for all the body’s functions, such as walking, talking, heart rate, etc.

5. Organ Systems
Groups of organs that work together to complete a series of tasks
Ex: Nervous System – brain, spinal cord,
Monitors changes inside and outside the body
Processes and interprets sensory input
Supplies response by activating muscles or glands

6. Other Organ Systems Digestive: breaks down food and absorbs nutrients
Excretory: removes solid, liquid and gas waste from the body
Respiratory: exchanges gases between the body and the environment
Circulatory: transports nutrients, gases, wastes and other substances through the body
Muscular: allows movement
Skeletal: protects internal organs, provides support, helps the body move and stores minerals

7. Homework
Choose a Graphic Organizer to illustrate the 5 Levels of Organization (cell, tissue, organ, organ system, organism). Be sure to include the definition and a picture.