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