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