Across
- 2. system made of sensory and motor neurons that transmit information between the central nervous system (CNS) and the rest of the body.
- 5. two narrow tubes that carry air into the lungs from the trachea.
- 13. a vessel that carries blood toward the heart.
- 14. a system that transports materials through blood using vessels.
- 17. a tubelike structure of neurons that sends signals to and from the brain.
- 19. system made up of the brain and the spinal cord.
- 21. a type of vascular tissue that carries water and dissolved nutrients from the roots to the stem and the leaves.
- 22. a tiny blood vessel that delivers supplies to an individual cell and takes away waste materials.
- 24. a small opening in the epidermis, or surface layer, of a leaf.
Down
- 1. system that transports blood and other fluids into open spaces that surround organs in the body.
- 3. a vessel that carries blood away from the heart.
- 4. a tube that is held open by C-shaped rings of cartilage; connects the larynx and the bronchi.
- 6. the part of an organism that gathers, processes, and responds to information.
- 7. a type of vascular tissue that carries dissolved sugars throughout a plant.
- 8. the lower two chambers of the heart.
- 9. specialized plant tissue composed of tubelike cells that transports water and nutrients in some plants.
- 10. the part of your nervous system that detects or senses the environment.
- 11. special structures in all parts of the sensory system that detect stimuli.
- 12. the upper two chambers of the heart.
- 15. microscopic sacs or pouches at the end of the bronchioles where gas exchange occurs.
- 16. a tubelike passageway at the top of the throat that receives air, food, and liquids from the mouth or nose.
- 18. the basic functioning unit of the nervous system; a nerve cell.
- 20. a large muscle below the lungs that contracts and relaxes as air moves into and out of your lungs.
- 23. the main organs of the respiratory system.