1. Organ Systems

2. Levels of Organization
Chemical (Subatomic Particles, Atoms, Molecules, Compounds)
Cellular (The smallest entity that is considered alive)
Tissues (A group of cells with a common structure and function)
Organs (Two or more tissues with a common structure and function)
Organ Systems (Two or more organs with common functions.
Organism

3. Organ System Overview Skeletal Protects and supports body organs
Provides muscle attachment for movement
Site of blood cell formation
Stores mineral
Figure 1.2b

4. Organ System Overview
Reproductive
Production of offspring
Figure 1.2k

5. Organ System Overview Integumentary Forms the external body covering
Protects deeper tissue from injury
Synthesizes vitamin D
Location of cutaneous nerve receptors
Figure 1.2a

6. Organ System Overview Muscular Allows locomotion Maintains posture
Produces heat
Figure 1.2c

7. Organ System Overview Nervous Fast-acting control system
Responds to internal and external change
Activates muscles and glands
Figure 1.2d

8. Organ System Overview Endocrine Secretes regulatory hormones Growth
Reproduction
Metabolism
Figure 1.2e

9. Organ System Overview Cardiovascular
Transports materials in body via blood pumped by heart
Oxygen
Carbon dioxide
Nutrients
Wastes
Figure 1.2f

10. Organ System Overview Lymphatic Returns fluids to blood vessels
Disposes of debris
Involved in immunity
Figure 1.2g

11. Organ System Overview Digestive Breaks down food
Allows for nutrient absorption into blood
Eliminates indigestible material
Figure 1.2i

12. Organ System Overview Urinary Eliminates nitrogenous wastes
Maintains acid – base balance
Regulates water and electrolytes
Figure 1.2j

13. Organ System Overview Respiratory Keeps blood supplied with oxygen
Removes carbon dioxide
Figure 1.2h