1. Human Body

2. The body has cells, tissues, and organs.
Body has many parts that work together as a system to help you grow and stay healthy.
Cells (simplest) -> tissues -> organs -> systems (made up of organs) -> organism (highest level)

3. Organization

4. Cells Basic unit of life
Some organisms have only a single cell (ex. bacteria)
In complex organisms (ex. humans) cells are specialized – perform specific tasks
Ex. red blood cell – carries oxygen and nutrients from lungs to body

5. Tissues Group of cells that work together Four types:
Epithelial – boundary of inner/outer surfaces of body
Nerve – messaging system
Muscle - movement
Connective – holds parts of body together

6. Organs
Groups of tissues working together to perform a task

7. Organ Systems Interact And Are Dependent Upon Each Other

8. Skeletal System
Skeletal system protects, supports, allows movement, produces blood cells, and stores minerals

9. Muscular System
Muscular system allows body movement and maintains posture

10. Digestive System
Breaks down food and absorbs nutrients

11. Circulatory System
Transports nutrients, wastes, and other materials

12. Respiratory System
Exchanges oxygen and carbon dioxide between blood and air

13. Nervous System
Detects sensation and controls most functions

14. Immune System
Protects the body, controls the immune response, and fights disease

15. Excretory/Urinary Systems
Removes solid and liquid wastes from body

16. Endocrine System
Helps with regulation of metabolism and other functions
Ex. Insulin controls glucose (sugar) levels in the bloodstream

17. Homeostasis Homeostasis is a constant internal environment
The endocrine and nervous system work together to keep the body in homeostasis
Example: Internal body temperature of approximately 98.6 ALL THE TIME

18. How well do you know the systems so far?