Controls and coordinates body activities.

Includes the brain, spinal cord, and nerves.

Interacts with the musculoskeletal system to control movement.

Breaks down food into nutrients the body can absorb and use for energy, growth, and repair.

Includes organs like the mouth, esophagus, stomach, intestines, liver, and pancreas.

Works with the circulatory system to transport absorbed nutrients through the blood to the rest of the body.

Transports oxygen, nutrients, hormones, and waste throughout the body via blood.

Includes the heart, blood, and blood vessels (arteries, veins, capillaries).

Interacts with the respiratory system to exchange gases—oxygen is absorbed and carbon dioxide is released in the lungs.

Brings oxygen into the body and removes carbon dioxide through breathing.

Includes the nose, trachea, lungs, and diaphragm.

Works with the circulatory system to deliver oxygen to the blood and remove carbon dioxide.

Produces and releases hormones that regulate metabolism, growth, mood, and more.

Includes glands like the pituitary, thyroid, adrenal, pancreas, and reproductive glands.

Works with the nervous system to help control body functions, especially in response to stress or changes in the environment.

Supports the body’s structure and allows movement through bones, muscles, and joints.

Includes bones, muscles, tendons, ligaments, and cartilage.

Works with the nervous system to control voluntary movements and reflexes.

Defends the body against infections and harmful invaders like bacteria, viruses, and fungi.

Includes white blood cells, antibodies, lymph nodes, and other immune organs.

Works with the circulatory system to transport immune cells throughout the body to fight infections.

Responsible for producing offspring and enabling reproduction.

Includes organs like the ovaries, testes, uterus, and penis.

Works with the endocrine system to regulate reproductive hormones that control processes like menstruation and sperm production.

American Heart Association. (2023). Circulatory system. https://www.heart.org

Cleveland Clinic. (2023). Musculoskeletal system. https://my.clevelandclinic.org

Healthline. (2023). Endocrine system. https://www.healthline.com
Mayo Clinic. (2023). Nervous system.

https://www.mayoclinic.org
National Institutes of Health. (2023). Immune system. https://www.nih.gov

National Institutes of Health. (2023). Respiratory system.

https://www.nih.gov
WebMD. (2023). Reproductive system. https://www.webmd.com