1. 2.1 Body Systems
A system is made of parts that work together as a whole.
The Characteristics of Systems
1. A system is made of individual parts that work together as a whole.
2. A system is usually connected to one or more systems.
3. If one part of a system is missing or damaged, the system will not function well or may not function at all.
A stereo system has many parts that work together.
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3. Systems of the Human Body
Eleven systems of the human body
Circulatory System
Transports blood, nutrients, gases, and wastes
Digestive System
Breaks down food and absorbs the nutrients
Respiratory System
Exchanges gases in lungs and tissues
Excretory System
Removes liquid and gas wastes from the body
Immune System
Defends body against infections
Endocrine System
Manufactures and releases hormones
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4. Systems of the Human Body
More Systems…
Reproductive System
Includes reproductive organs for producing offspring
Integumentary System
Creates a waterproof barrier around the body
Skeletal System
Supports, protects, and works with muscles to move parts of the body
Muscular System
Has muscles that work with the bones to move parts of the body
Nervous System
Detects changes in the environment and signals the body to carry out a response
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5. Circulatory System

6. Digestive System

7. Respiratory System

8. Excretory System

9. Immune System

10. Endocrine System

11. Reproductive System

12. Integumentary System

13. Skeletal System

14. Muscular System

15. Nervous System

16. Organ Systems
An organ system has one or more organs that perform specific body functions.
For example your heart is part of the circulatory system.
The four levels of organization within the human body are:
cell tissue organ organ system
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17. Organ Systems
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18. Tissues: The Foundation of Body Systems
Tissue is a group of cells that have the same structure and function.
Four types of body tissue:
Muscle tissue
Assists in body movement
Nerve tissue
Transfers signals to and from brain
Connective tissue
Holds together and supports other tissue
Epithelial tissue
Covers the surface of organs and body
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(c) McGraw Hill Ryerson 2007

19. Take the Section 2.1 Quiz