Across
- 4. Blood returns through _______.
- 5. Where digestive and respiratory systems meet.
- 7. The "windpipe."
- 9. Communication line made from bundles of neuron fibers wrapped in connective tissue.
- 12. Interferes with the delivery of oxygen to body cells. Carbon ________.
- 13. When so much CO2 is purged out that the brain stops sending messages to the diaphragm
- 17. Thin walled parts of the heart that pump only to ventricles.
- 18. Anything that causes a nerve signal to start.
- 20. Manipulates pitch and volume; "voice-box".
- 21. A major muscle aiding in inhalation.
- 22. Clusters of air sacs.
- 25. Layers of connective tissue for protection of brain.
- 28. The brain and spinal cord makes up the ______ nervous system.
Down
- 1. High blood pressure. "Silent killer".
- 2. Chemical that carries information from one neuron to another type of cell that will react.
- 3. We take breaths through _______ pressure breathing.
- 6. We have a ______ circulatory system (single/double).
- 8. Long, single fiber. Conducts signal towards another neuron or effector.
- 10. A disease that causes alveoli to disintegrate.
- 11. Allow for diffusion between blood and tissue cells.
- 14. Carries blood between heart and lungs. ________ circuit.
- 15. Thick walled part of the heart. Pumps blood to body and back.
- 16. The master control center of the human body.
- 19. Connects the two hemispheres of brain so they can process info together. Corpus _______.
- 21. The relaxation phase of the cardiac cycle.
- 23. Disease caused by iron deficiency.
- 24. Prevent back-flow in the circulatory system.
- 26. Mainly nerve and cell bodies. ______ Matter.
- 27. A bundle of nerve cell fivers inside the spinal column. ______ cord
- 28. We have a _______ circulatory system.