Human Body

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Across
  1. 3. Tiny lung air sacs where oxygen and carbon dioxide are exchanged
  2. 6. ventilation Movement of air in and out of lung air sacs
  3. 7. Process of removing waste products from the body
  4. 8. Wave-like muscle contractions that move food through the digestive tract
  5. 13. Gap where signals pass between neurons
  6. 14. Voice box that produces sound and allows airflow
  7. 15. First section of the small intestine where digestion continues
  8. 17. Glands in the mouth that produce saliva to help break down food
  9. 18. Microscopic kidney unit that filters blood and forms urine
  10. 19. Neuron that connects other neurons within the brain and spinal cord
  11. 20. A single muscle cell responsible for contraction
Down
  1. 1. artery Blood vessels that supply the heart muscle with oxygen-rich blood
  2. 2. Support cells that protect and assist neurons
  3. 4. Nitrogen waste produced from protein breakdown and removed in urine
  4. 5. artery Blood vessel that carries oxygenated blood to the kidneys
  5. 9. circulation Circulation that carries oxygenated blood from the heart to the body
  6. 10. circulation Blood flow between the heart and lungs for oxygen exchange
  7. 11. Tiny structure inside muscle cells that allows contraction
  8. 12. Muscles that bend and straighten joints
  9. 16. Throat passageway for both air and food