Match the following. 1. defends the body after it has been invaded by a microscopic organism. immune system 2. regulates the body's metabolism, growth, and functions of the sexual organs. integumentary system 3. protects the internal tissues of the body from potential harm. muscular system 4. responsible for conception. reproductive system 5. provides the body with a framework that is strong and mobile endocrine system 6. consists of 600 skeletal muscles that allow the body to move. circulatory system 7. carries life-giving blood to the cells. skeletal system

Human body has seven main systems which perform specific functions:

1. Immune System defends the body after it has been invaded by a microscopic organism.

2. Endocrine System regulates the body's metabolism, growth, and functions of the sexual organs.  

3. Integumentary System protects the internal tissues of the body from potential harm.  

4. Reproductive System responsible for conception.  

5. Skeletal System provides the body with a framework that is strong and mobile  

6. Muscular System consists of 600 skeletal muscles that allow the body to move.  

7. Circulatory System carries life-giving blood to the cells.  

All these systems are necessary for the proper functioning of the body.

risky behaviors. many behaviors are risky for your health and happiness. the main hazards include using tobacco, alcohol, and sexual activity.