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Across 5. An elastic bag-type organ consisting of three muscle layers 7. These bring the blood back to the heart 8. Organ in which sperm is produced 10. The time in which a female carries a maturing embryo/fetus 12. The highest point of the brain stem 13. Wind pipe 14. Regulates the amount of water in the body 17. The tiniest blood vessels 18. This system is responsible for breaking down food into absorbable nutrients 20. Where food enters 21. Consists of erectile tissue and nerve endings similar to the male penis 22. Blood cells that absorb carbon dioxide from tissues 23. In adulthood there are 206 of these in the body 25. These cells send messages to your brain 27. A collapsible bag near the front of the pelvis 30. The hair in your nostrils 31. Air sacs 33. The middle, thick muscular layer of the heart 34. This type of exam is offered to both males and females 35. The largest artery 37. Made up of the skull, spinal column, rib cage and sternum 39. Oval shaped organ beside the stomach on the left side of the upper abdominal cavity 40. Egg Cell

Down 1. Indigestible parts of food are moved into this intestine 2. Skin and muscular covering of the testes 3. Regulates the blood sugar level 4. Where waste leaves the body 6. Shin bone 9. These are used as a clotting mechanism 11. This system contains the heart, blood vessels, and the blood 15. This system assures the continuation of the human species 16. Where carbon dioxide is exchanged for oxygen 17. The part of your brain that controls your balance 19. Type of bones that include the vertebrae, carpals, tarsals, and patella 24. Type of join allowing movement in two planes 26. The means in which urine is excreted from the body 28. The voice box 29. Shoulder blade 32. The point where two nerve processes meet 36. Chews the food 38. The largest internal organ