Body Systems

3. This system is made up of the brain, spinal cord, and nerves. It is your body’s control system.
5. These are areas within the body where two or more bones meet.
7. This organ in the nervous system receives messages from and transmits messages to the nerves of the body.
9. The smallest living unit.
11. Blood vessels that carry oxygen-poor blood back to the heart.
12. This connective tissue attaches skeletal muscle to bone.
15. This system brings oxygen into the body and removes carbon dioxide.
17. Tiny blood vessels that connect arteries to veins. These blood vessels carry oxygen/nutrients to individual cells.
19. This organ within the digestive system breaks food down further mechanically and chemically.
20. This system is made up of organs that break down food into nutrients which the body needs for energy, growth, and repair.
21. Blood vessels that carry oxygen-rich blood away from the heart.

1. This is made up of tissues that work with the skeletal system to control movement of the body.
2. This organ is the pump in the cardiovascular system that sends blood moving throughout the body.
4. The largest organ in the body.
6. This system is made up of bones, ligaments, and cartilage. It shapes your body and protects your organs.
8. This system is made up of your skin, hair, and nails.
10. This organ within the digestive system allows food to move from the mouth to the stomach.
13. This system is made up of organs that transport blood throughout the body.
14. This connective tissue holds the bones of the skeletal system together.
16. Your body's skin does this to keep it cool when the body becomes too hot.
18. These breathing organs in the respiratory system bring oxygen to and carbon dioxide from the blood.