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