1. Human Body Systems
An Introduction

2. Remember, the human body is organized in several levels, from the simplest to the most complex. . .
Cells – the basic unit of life
Tissues – clusters of similar cells performing a similar function. Contains all one type of cell
Organs – made of tissues that perform one specific function. Contains different types of cells
Organ Systems – groups of organs that perform a specific purpose in the human body
***The purpose of the 11 organ systems is for the human body to maintain homeostasis.

3. Digestive System
Purpose: to break down food particles into smaller micromolecules that can be absorbed into the bloodstream and used by the cells of the body.

4. Excretory System
Purpose: to rid the body of wastes, including excess water and salts

5. Respiratory System
Purpose: to provide the body with a fresh supply of oxygen for cellular respiration and remove the waste product carbon dioxide

6. Circulatory System
Purpose: to deliver oxygen, food, and other molecules to the various cells. Removes waste products, like CO2, from cells. Circulates materials around the body

7. Nervous System
Purpose: to coordinate the body’s response to changes in its internal and external environment

8. Sensory Nerves allow us to feel; hot, cold, pressure, pain
Sensory Nerves allow us to feel; hot, cold, pressure, pain. Motor Nerves allow us to move muscles

9. Endocrine System
Purpose: to control growth, development, metabolism and reproduction through the production and secretion of hormones

10. Skeletal System
Purpose: to provide structure and support to the human body
Bones are where new blood cells are made (in the bone marrow)

11. Muscular System
Purpose: works with the skeletal and nervous system to produce movement, also helps to circulate blood through the human body

12. Immune (& Lymphatic) System
Purpose: to destroy and remove infectious diseases ( bacteria and viruses) from the human body

13. Integumentary System
 Purpose: to act as a barrier to protect the body from the outside world. It also keeps the body from dehydrating, protects against disease and helps regulate body temperature.
The main organs of this system consists of the skin, hair, nails & glands

14. Reproductive System
The Reproductive System: Allows organisms to reproduce and pass their characteristics on to offspring