Human Body

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