Across
- 5. term meaning "oxygen-poor"
- 7. the blood vessels that carry blood back to the heart
- 8. one of the main products absorbed by small intestine
- 11. the space in between two neurons
- 13. wave-like contractions of smooth muscle
- 16. similar tissues working together to perform a job
- 17. the type of neuron that sends information to the brain
- 18. the thinnest blood vessel
- 20. the muscle type found in blood vessels and intestines
- 21. another term for a nerve cell
- 24. the only voluntary muscle type
Down
- 1. the simplest level of organization
- 2. the thing, long fiber that carries an electrical impulse away from the cell body
- 3. the system that transports oxygen to all cells
- 4. the largest artery in the body
- 6. the system responsible for sensing the environment
- 9. the system that removes gas waste
- 10. the unit of the kidney that filters blood
- 12. the projects that carry an electrical impulse to the cell body
- 14. the lobe responsible for decision-making and planning
- 15. the fatty layer of insulation around a neuron
- 19. blood from the heart goes here to pick up oxygen
- 22. the type of neuron in the brain
- 23. this is what the excretory system cleans