Across
- 4. a large, dome-shaped muscle located at the base of the lungs that helps with breathing
- 7. the division of the nervous system consisting of the brain and spinal cord
- 10. muscle that is attached to the bones of the skeleton and provides the force that moves the bones
- 11. a muscular tube that connects the mouth to the stomach
- 14. a cell that carries information through the nervous system
- 17. involuntary muscle found inside many internal organs of the body
- 20. the junction where one neuron can transfer an impulse to the next structure
Down
- 1. involuntary muscle tissue found only in the heart
- 2. a major organ of the excretory system; removes urea and other wastes from the blood
- 3. organ found in air-breathing vertebrates that exchanges oxygen and carbon dioxide with the blood
- 5. division of the nervous system consisting of all nerves located outside the central nervous system
- 6. a blood vessel that carries blood back to the heart
- 8. the windpipe; a passage through which air moves in the respiratory system
- 9. waves of smooth muscle contraction that move food through the esophagus toward the stomach
- 12. the throat; part of both the respiratory and digestive systems
- 13. a blood vessel that carries blood away from the heart
- 15. the process by which wastes are removed from the body
- 16. a bundle of nerve fibers
- 18. a watery fluid produced by the kidneys that contains urea and other wastes
- 19. a hollow, muscular organ that pumps blood throughout an organism’s body