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Across 1. These blood vessels carry blood toward the heart. 2. These are where oxygen is exchanged between the blood and circulatory systems. These expand during inhalation and contract during expalation. 7. Urine is eliminated from the body through this tube. 8. This holds urine before it is released from the body. 9. This produces chemicals, such as digestive enzymes, to help that digest food. 11. These proctect the spinal cord and support the head and back. 12. This tube connects the throat and nose to the bronchial tubes. 13. Air passes through these just before it reaches the lungs. 17. This is a bundle of nerves that connects your brain to all the rest of your body. 18. This holds solid waste before it is expelled from the body. 19. These begin the process of mechanical digestion. 21. These contract to help the body to move. 26. These provide support for body and are where blood cells are produced. 28. This pump works every mintue of life. 29. These are tubes that urine passes through from the kidneys to the bladder. 30. In one of these tubes between the ovaries and uterus an egg is fertillized. 31. These sense the outside world and communitcate with the rest of the body's system. 32. Sperm are produced here.

Down 1. This is a tube-shaped passage from the uterus to the outside of your body. 2. This produces bile, which helps digest fats, break down toxins, and regulates cholesterol and sugar in the blood. 3. This signals the body to react to changes in the environment, such as danger to the smell of food 4. This stretchy muscular sac holds food. 5. Air enters the body here. 6. These are the tiny sacs where the exchange of oxygen and carbon dioxide takes place. 10. This absorbs water from food, stores wastes, and eventually eliminates water from the body. 14. This moves food from the mouth into the stomach. 15. In these tiniest vessels blood and organs exchange nutrients and waste. 16. A fertillized eggs grow here. 17. Nutrients are absorbed from food and go into the blood here. 20. Sperm exit the body here. 22. Semen passes through these tubes from the testes to the urethra. 23. This protects the lungs and supports breathing. 24. These remove wastes from food and go into the blood here. 25. Eggs develop in these. 27. These blood vessels carry blood away from the heart.