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Across 1. a quick, automatic response to a stimulus; ex. blinking 7. stores urine 8. a group of different tissues that work together; ex the eye 9. a large muscle that contracts to allow you to inhale 13. the process of sperm joining an egg 16. helps protect the body from disease 17. a group of organs that work together; ex. nervous sys. 20. supports the body, protects internal organs, allows for movement 21. body defense against abnormal cells and pathogens; destroyed by HIV 23. oxygen-poor blood from the upper and lower parts of the body enters the heart here 29. oxygen-rich blood enters the heart here 32. the smallest blood vessels 35. carry oxygen-poor blood 37. pumps oxygen-poor blood to the lungs 38. eliminates liquid waste from the body 39. chemical formula for energy 41. contain hemoglobin that binds to oxygen 42. chemicals used to transmit messsages between neurons 45. exchanges gases for the body: takes in oxygen and release carbon dioxide 46. anything that triggers an immune response; ex. viruse, bacteria or other pathogen 47. transports oxygen, nutrients, and hormones to cells; removes waste 48. produces estrogen and progesterone; makes the egg 49. relays messages, processes information, and "thinks" 50. not under your control; moves food through the digestive tract 51. heart muscle

Down 2. propels food from the mouth to the stomach 3. disease; an uncontrollable growth of cells 4. cells that transmit impulses/messages for the nervous sys. 5. produces insulin to regulate blood sugar levels 6. the basic unit of living things 10. proteins that recognize and bind to antigens 11. found only in the heart 12. filters waste from the blood 14. the largest organ in the human body; part of the integumentary system 15. most chemical digestion and absorption of nutrients occurs here 18. consists of all the nerves that are not part of the brain or spinal cord 19. attached to bone; responsible for voluntary movement 22. breaksdown food; absorbs nutrients; eliminates solid waste 24. produces testosterone; makes the sperm 25. works with skeletal system to produce movement; helps circulate blood 26. pumps oxygen-rich blood to the body 27. controls growth and development using hormones 28. makes red blood cells and some white blood cells 30. removes water from undigested food 31. a barrier against bacteria; protects against ultraviolet radiation 33. windpipe 34. tiny air sacs 36. guard against infection, fight parasites, attack bacteria 40. a group of cells that perform a single function; ex. blood 43. carry oxygen-rich blood 44. prevent blood from flowing back into the atria; ex. mitral