Body Systems

2. Intestine The organ where most digestion is completed and nutrients enter the bloodstream.
5. The body system responsible for supplying oxygen and removing carbon dioxide.
7. A muscle whose movement changes the size of the chest cavity during breathing.
8. The process of drawing oxygen-rich air into the lungs.
11. A bony structure that protects one of the body's most important organs.
15. Tiny blood vessels where materials move between the blood and body cells.
17. The framework of bones that gives the body shape and support.
21. A transport system that carries oxygen, nutrients, and wastes to different parts of the body.
23. Blood vessels that return blood to the heart after it has traveled through the body.
24. The body system that provides support, protection, and structure.
27. A muscular tube that moves food toward the stomach after swallowing.
28. An organ that uses muscles and digestive juices to break food into smaller pieces.
30. Blood vessels that carry blood away from the heart under high pressure.
31. Blood cells specialized to transport oxygen throughout the body.
33. Useful substances obtained from food that support growth, repair, and energy needs.
34. The continuous movement of blood that helps body systems work together.
35. Blood cells that help protect the body from disease-causing organisms.
37. Tiny structures that provide a large surface area for gas exchange.

1. Flexible tissue that reduces friction and cushions the ends of bones.
3. Tissues that contract and relax to create movement.
4. Organs that exchange gases between the air and the bloodstream.
6. A gas that body cells need to release energy from nutrients.
9. Connective tissues that hold bones together and stabilize joints.
10. A sign of blood being pushed through arteries each time the heart contracts.
11. A column of bones that supports the body and protects the spinal cord.
12. The main airway that connects the throat to the lungs.
13. A waste gas produced by cells and removed by the respiratory system.
14. The body system that breaks food into nutrients the body can use.
16. Strong connective tissues that attach muscles to bones.
18. Living structures that support the body and help produce blood cells.
19. Locations where bones meet and movement can occur.
20. The structure where both mechanical and chemical digestion begin.
22. A substance that moistens food and begins the breakdown of starches.
25. The process of removing air that contains carbon dioxide from the lungs.
26. Two large air passages that carry air from the trachea into each lung.
29. The organ that creates the force needed to move blood throughout the body.
32. Intestine The organ that removes water from waste before it leaves the body.
36. The process of changing food into forms that cells can absorb and use.