1. Organ Systems Objective 1 – 2

2. Levels of Organization Every organ system has the same basic design Cells  Tissue  Organ  Organ System Cells are the building blocks Groups of Cells of the same type are Tissue Groups of different types of Tissue working together are an Organ Groups of Organs working together are an Organ System (Body System)

3. 11 Organ Systems NervousIntegumentary Skeletal Muscular Circulatory SystemSystem System System System

4. Top (from left to right) - Respiratory System - Digestive System - Excretory System Bottom (from left to right) - Endocrine System - Reproductive System - Immune System

5. Homeostasis 10 body systems are required for survival They work together to maintain a stable internal environment (homeostasis)

6. Nervous System Recognizes and responds to stimulus Neurons 1. Sensory Neurons carry signals to the brain 2. Inter Neurons (brain) interpret signals 3. Motor Neurons carry signals from the brain to the muscles

7. Immune System Functions 1. Protect from infection 2. Helps balance fluids White blood cells, lymph nodes, mucus, etc.

8. Reproductive System Functions 1. Produce reproductive cells 2. Nurture and protect developing embryo (females only) Male: Urethra, testes, etc. Female: Ovary, uterus, etc.

9. Integumentary System Protective barrier 1. Environment 2. Sunlight Skin, hair, nails, etc.

10. Skeletal System Functions: 1. Structure 2. Support 3. Protection 4. Movement Bones, cartilage, etc.

11. Muscular System Functions 1. Movement 2. Circulates Blood 3. Helps with Digestion Muscles

12. Circulatory System Functions 1. Supplies cells with oxygen and nutrients 2. Removes waste Heart, blood vessels

13. Respiratory System Functions 1. Provides oxygen 2. Removes carbon dioxide Nose, trachea, lungs, etc.

14. Digestive System Functions 1. Converts food into nutrients the cells can use 2. Eliminates waste Mouth, stomach, intestines, etc.

15. Excretory System Eliminates waste Kidneys, bladder, urethra, etc.

16. Endocrine System Functions 1. Growth 2. Development 3. Metabolism Pituitary gland, adrenals, pancreas, etc.