1. Chapter 1 Introduction to the Human Body section 1

2. Cells The average human adult consists of 100 trillion cells!!!!!!!
Cells are the basic unit of structure and function
In all living cells
Human cells have characteristics for carrying out special functions

3. Groups of cells working together form a TISSUE
There are 4 types of tissues:

4. EPITHELIAL TISSUE
Covers and protects underlying tissue. When you look at the surface of your skin, you see epithelial tissue

5. MUSCLE TISSUE
Made up of cells that can contract and relax to produce movement

6. NERVOUS TISSUE
Sends electrical signals through the body. It is found in the brain, nerves and sense organs.

7. CONNECTIVE TISSUE
Joins, supports, protects, insulates, nourishes, and cushions organs. It also keeps organs from falling apart.

8. TISSUE + TISSUE= ORGAN
Two or more tissues working together, form an organ
One type of tissue alone cannot do all of the things that several types working together can do.

9. ORGAN + ORGAN = ORGAN SYSTEM
Organs working together make up an organ system.
The failure of any part can affect the entire system

10. 11 MAJOR ORGAN SYSTEMS Integumentary system Muscular system
Skeletal system
Cardiovascular system
Respiratory system
Urinary system
Reproductive system.
Nervous system
Lymphatic system
Digestive system
Endocrine system

11. Integumentary System
Includes skin, hair, nails and their underlying tissues

12. Skeletal muscles move bones.
Muscular System
Skeletal muscles move bones.

13. Skeletal System
Bones frame and protect body parts.

14. Cardiovascular System
The heart pumps blood through blood vessels.

15. Respiratory System
Lungs absorb oxygen and release carbon dioxide.

16. Removes wastes from the blood and regulates body fluids.
Excretory System
Removes wastes from the blood and regulates body fluids.

17. Reproductive System
Females produces eggs, feed/shelter unborn baby- males produce sperm.

18. Receives and sends electrical messages.
Nervous System
Receives and sends electrical messages.

19. Lymphatic System
Returns leaked fluids to blood vessels and helps flush harmful germs out.

20. Digestive System
Breaks down food into nutrients.

21. Endocrine System
Glands regulate body functions by sending out chemical messages.

22. HOMEOSTASIS
The human body’s maintenance of a stable internal environment.
Body Systems working together
If homeostasis is interrupted, cells suffer and sometimes die