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