Major Systems of the Body

2. A gas that is essential for respiration and is transported by the circulatory system.
4. The organ in the nervous system that processes information and controls body functions.
7. System The system that provides structure and protection for organs, supports the body, produces blood cells, and stores minerals.
9. System The system that controls and coordinates body functions, processing information and allowing us to think and feel.
11. An organ in the digestive system that breaks down food.
14. The organs in the respiratory system that facilitate gas exchange.
15. System The system that defends the body against harmful substances, fighting off infections and diseases.
17. Chemical substances produced by the endocrine system that regulate various body functions.
18. System The system responsible for transporting blood, oxygen, and nutrients throughout the body.
19. Substances obtained from food that are essential for growth and health.

1. System The system that breaks down food for energy and nutrients, and eliminates waste.
3. The set of life-sustaining chemical reactions in the body, regulated by the endocrine system.
5. System The system that enables breathing and gas exchange, providing oxygen to the body and removing carbon dioxide.
6. System The system that protects the body and regulates temperature, including skin, hair, and nails.
8. System The system that enables movement and maintains posture, including skeletal, smooth, and cardiac muscles.
10. The structures in the skeletal system that provide support and protection.
11. The largest organ in the integumentary system that protects the body.
12. The organ that pumps blood throughout the circulatory system.
13. System The system that produces hormones to regulate body functions, controlling growth, metabolism, and mood.
16. Blood Cells Cells in the immune system that fight infections.